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David Sinclair engagement report

@davidasinclair - 666K followers on X

Measured over 39 original posts from a 30-day window, last computed on October 5, 2026.

Engagement

Top quarter for its size
Per follower
0.141%
of 666K followers
Per impression
1.73%
54K views on a typical post
Reach
8.15%
of its followers see a post
Typical post
933
interactions (median)
Saved
0.174%
94 bookmarks on a typical post
Posting rate
3.43/day
active 67% of days
Peak time
14:00 UTC
Thursday

A typical post picks up 933 interactions against 666K followers, an engagement rate of 0.141%. Measured over 39 original posts, its engagement rate beats 76% of 20,444 tracked accounts of a similar size. Comparing inside a size band matters here: engagement rate falls as accounts grow, so a raw rate would mostly just re-measure the follower count. Posts are seen about 54K times each, and 1.73% of those impressions turn into an interaction. That is about 8.12% of the follower count, which is the gap between an audience on paper and an audience in a timeline. Posting runs at about 3.4 posts a day over the last 30 days, with activity on roughly 67% of days. Most posts go out around 14:00 UTC, and Thursday is the busiest day of the week. Of the 39 posts sampled, 23% carry an image or video, 15% are part of a thread and 41% link out. The account's strongest tracked post pulled 7.4K interactions, about 7.9x its own typical post.

Measured over 39 original posts from a 30-day window, last computed on October 5, 2026. Recurring tag: #ardd2026.

Compared with accounts its own size

David Sinclair's engagement rate beats 76% of the tracked X accounts closest to it in follower count (20,444 accounts, accounts of similar size (decile 10 of 10)). A percentile is spread evenly by construction, so 50 really is the middle of that group and 90 really is its top tenth.

On engagement per impression rather than per follower it beats 63% of the same group. When those two numbers disagree, the gap is about how far its posts travel rather than how people react to them.

Where this sits in the catalog

At 0.141%, David Sinclair sits above the 25th percentile of the 204,694 accounts in this comparison. That places it in the below the median band, which runs 0.024% to 0.143%.

p100.004%
p250.024%
p50 (median)0.143%
p750.677%
p902.55%
p9982.4%
Engagement rate as a share of followers, across the 204,694 accounts we have scanned enough to measure. The axis is logarithmic, because the top and bottom of this population are about 22,880 times apart and a linear axis would flatten everything below the median into a single point.
Show the percentile table
Engagement rate percentiles
PercentileEngagement rate
10th percentile0.004%
25th percentile0.024%
50th percentile0.143%
75th percentile0.677%
90th percentile2.55%
99th percentile82.4%

This ruler is the whole measured catalog, not a size-matched group: it shows where the raw rate falls across every account we can measure, all of which are large. For a like-for-like comparison, read the size-band percentile above instead. See how the bands are built

Posting timing

This account posts most often around 14:00 UTC, and Thursday is its busiest day of the week. The bars below are the catalog-wide pattern, with this account's own busiest slot marked. They do not show how this account performs at each hour: we keep one aggregate per account, not one per hour, so that measurement does not exist in our data.

Engagement by hour posted, UTCTwenty-four bars, one per UTC hour. Each bar shows how posts published in that hour compare with their own authors' median engagement. Bars above the centre line ran higher than the median, bars below ran lower. A marker flags Busiest hour: 14:00 UTC.
0003060912151821
Above the authors' own mediansBelowScale: plus or minus 111%Busiest hour: 14:00 UTC
Show engagement by hour posted, utc as a table
Engagement by hour posted, UTC
Hour (UTC)Vs author medianPosts
00:00 UTC-1%89K
01:00 UTC-2%90K
02:00 UTC-3%88K
03:00 UTC-4%94K
04:00 UTC-5%76K
05:00 UTC-4%75K
06:00 UTC-5%86K
07:00 UTC-5%93K
08:00 UTC-4%108K
09:00 UTC-4%124K
10:00 UTC-3%129K
11:00 UTC-3%141K
12:00 UTC-3%154K
13:00 UTC-3%167K
14:00 UTC-4%173K
15:00 UTC-2%176K
16:00 UTC-3%171K
17:00 UTC-3%159K
18:00 UTC-2%149K
19:00 UTC-2%141K
20:00 UTC-1%131K
21:00 UTC0%116K
22:00 UTC-2%100K
23:00 UTC-1%90K
Engagement by day of weekSeven bars, one per weekday, Sunday first. Each bar shows how posts published on that day compare with their own authors' median engagement. Bars above the centre line ran higher than the median, bars below ran lower. A marker flags Busiest day: Thursday.
SunMonTueWedThuFriSat
Above the authors' own mediansBelowScale: plus or minus 111%Busiest day: Thursday
Show engagement by day of week as a table
Engagement by day of week
DayVs author medianPosts
Sunday+5%393K
Monday+1%483K
Tuesday-2%520K
Wednesday-3%472K
Thursday-2%430K
Friday-3%447K
Saturday+2%393K
See what moves engagement across the whole catalogWhat counts as a good engagement rate at this size

Formats this account uses

Its own posting mix on the left, and what each of those formats does across every account we track on the right. Only formats where the effect clears our publish test appear here, so an empty row is a format we could not measure rather than one that does nothing.

This account's posting mix compared with catalog-wide effects
FormatThis accountCatalog effect95% intervalAccounts behind it
Image or video23% of posts+111%+108% to +115%34K
Outbound link41% of posts-41%-42% to -40%32K
Typical length--3%-3% to -2%54K
  • 23% of this account's sampled posts carry an image or video. Across the catalog, posts with an image or video run 111% above the same accounts' other posts.
  • 41% of its posts carry a link off X. Across the catalog, posts with an outbound link run 41% below the same accounts' other posts, so a large share of this account's output sits in the weakest bucket we measure.
  • Its average post runs 174 characters, which falls in the 80 - 180 characters band. Across the catalog, posts of 80 to 180 characters run 3% below the same accounts' other posts.

These are catalog-wide differences applied to this account's own posting mix, not a measurement of how each format performs for this account specifically. We keep one median per account, not one per format per account, so the second thing is not something this data can tell you.

Best tweets

  • Sep 6, 20267.9x their median

    96yr old "Addams Family" star — JOHN ASTIN — with his son, SEAN ASTIN (Lord Of The Rings) 55. https://t.co/V3jguE5NKe

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  • Aug 12, 20267.2x their median

    https://t.co/rUN1cPDY65

    5.3K81515843413M viewsView on X
  • Aug 8, 20265.9x their median

    I’m incredibly proud & excited to finally share what we’ve been building for the past 3 years… https://t.co/rwNzbHYUiy is now live 🚀 In a world of conflicting health advice, how can anyone distinguish between what’s supported by science and what’s just opinion? I wanted to build something new. A place where scientists, engineers, industry leaders, and the public come together, where people can understand what the science actually says, and where we move healthcare beyond treating sickness toward extending healthy lifespan well beyond what’s currently possible. Explore the new Lifespan Magazine. Watch the Lifespan show. Ask scientists questions. Join a global community. And help support research and the next generation of scientists working to extend healthy human lifespan. I believe we’re at the beginning of a revolution in our understanding of human aging, and perhaps one day, our ability to change it. I want everyone to be part of it. Built by scientists. Built for you. https://t.co/rwNzbHYUiy Life’s too short. Let’s change that, together! 👊 —— Note: The views of Lifespan & its team are their own & do not represent the views of Harvard, Harvard Medical School, or their affiliates✌️

    4.8K52519336350K viewsView on X
  • Sep 21, 20263.6x their median

    Stem cells don't run out, they get told to stop dividing and that instruction can be renegotiated

    3.0K1829412172K viewsView on X
  • Sep 24, 20263.0x their median

    Every workout is a message to your body: stay strong, stay capable, stay young.

    2.5K1795914121K viewsView on X
  • Sep 24, 20262.8x their median

    Walk when you can. Lift something heavy. Occasionally get out of breath. Your older self will thank you.

    2.4K140601157K viewsView on X
  • Oct 1, 20262.5x their median

    New news: Life Biosciences will present first-in-human data from the Phase 1 trial of ER-100 in optic neuropathies at the Eyecelerator Conference in New Orleans, Oct, 8, 2026, 2:10PM CT 👀

    2.1K1708234112K viewsView on X
  • Sep 23, 20262.5x their median

    Arterial calcification is not just the accumulation of cholesterol. It is an active biological program in which vascular cells begin behaving like bone-forming cells and they start building bone. Could loss of epigenetic information be pushing them to forget what they are? https://t.co/8pWwolztPD

    2.0K16010715150K viewsView on X
  • Aug 3, 20262.4x their median

    1/10 I'm a cardiologist. I've recommended low-dose daily tadalafil for years — not for the bedroom, but for the blood vessels. Most people think of these as sex drugs. I think of them as vascular drugs that happen to work below the belt. And a study published two weeks ago suggests they may do something nobody predicted: make it harder for cancer to spread. Here's the complete picture — the mechanism, the evidence, who should consider them, who absolutely shouldn't, and what I actually do.

    2.0K15061251.1M viewsView on X
  • Sep 26, 20262.3x their median

    Muscle is more than strength. It is independence, resilience and the freedom to keep doing what you love

    1.9K13654961K viewsView on X

Ranked by total interactions across everything we have tracked for this account, which is a longer history than the 30-day window the rates above use. The multiple compares each post to this account's own median.

Recurring topics

#ardd2026

The most frequent hashtags in the sampled posts. They describe what this account writes about; they are not a performance signal, and the catalog-wide breakdown on the hub shows how little hashtag count moves.

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Reading these numbers

A typical post picks up 933 interactions against 666K followers, an engagement rate of 0.141%. Measured over 39 original posts, its engagement rate beats 76% of 20,444 tracked accounts of a similar size. Comparing inside a size band matters here: engagement rate falls as accounts grow, so a raw rate would mostly just re-measure the follower count. Posts are seen about 54K times each, and 1.73% of those impressions turn into an interaction. That is about 8.12% of the follower count, which is the gap between an audience on paper and an audience in a timeline. Posting runs at about 3.4 posts a day over the last 30 days, with activity on roughly 67% of days. Most posts go out around 14:00 UTC, and Thursday is the busiest day of the week. Of the 39 posts sampled, 23% carry an image or video, 15% are part of a thread and 41% link out. The account's strongest tracked post pulled 7.4K interactions, about 7.9x its own typical post.

What is David Sinclair's engagement rate on X?
David Sinclair (@davidasinclair) has an engagement rate of 0.141%, based on the median interactions across 39 original posts from the last 30 days against 665,601 followers. Replies, reposts and quote-posts of other people are excluded from that sample.
Is that a good engagement rate?
At 0.141%, David Sinclair sits above the 25th percentile of the 204,694 accounts in this comparison. Those comparison accounts are all large ones, because our scanning cadence is weighted towards big accounts, so this is a ranking among peers of similar scale rather than a ranking across X.
Does @davidasinclair have real engagement?
Its engagement rate beats 76% of the tracked X accounts closest to it in follower count (20,444 accounts), which puts it in the top quarter for its size group. Ranking inside a size band matters because engagement rate falls as accounts grow, so a raw rate would mostly re-measure the follower count. It is a starting point for a look at follower quality, not a verdict on it.
When does @davidasinclair post?
Most posts go out around 14:00 UTC, and Thursday is its busiest day, at roughly 3.43 posts per day across the measured window.

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