I Put 24

We did one of those videos where everyone labels their age. Three of the four numbers up there are honest. Mine is not. I put 24, which is a lie by roughly two decades, and I want to talk about why it did not feel like one.

I wrote a while back about the company you keep — that who you spend time with is a longevity lever sitting right next to sleep and training, and that most people optimising everything else quietly ignore it. That piece was about peers. People at your level, pointed the same direction.

This is the other axis — across generations. Spending your days around people who are nine, eleven, and young enough to find your knees funny.

The part I skipped last time

Holt-Lunstad's meta-analysis — 148 studies, 308,849 people — found roughly 50% higher odds of survival for people with strong social relationships. That is the headline I quoted last time and it holds up.

Here is the detail I left out, and it turns out to be the whole point of this article. The effect was not uniform. It depended enormously on what was actually measured:

Read that carefully, because I got it wrong the first time I looked at it. Those rows are not two levels of social contact — they are two ways of measuring. Complex indices combining marital status, network size and participation predicted survival far better than asking whether someone lives alone, and the living-alone confidence interval included no effect at all. Part of that gap is probably just better measurement.

Still, what the good instruments capture is depth rather than presence — participation, obligation, being counted on. And whatever else children are, they are very hard to be merely adjacent to. There is no version of living with a nine-year-old where you are technically present and mentally elsewhere, and if you try it, he will tell you.

The grandparent data

The closest observational evidence comes from the Berlin Aging Study. Among 312 grandparents aged 70 and up, the 80 who reported non-custodial grandchild care had a 37% lower adjusted mortality hazard than the non-caregiving ones — HR 0.63, confidence interval 0.41 to 0.96 — over roughly twenty years of follow-up.

That number gets passed around a lot, usually without two things attached to it. The study did not establish a dose-response curve, and it excluded primary and custodial caregivers entirely. Separate research on custodial grandparenting points the other way: role overload, financial strain, disrupted sleep, isolation, worse health.

Some weeks the load still feels like too much, and I am not going to pretend otherwise. But unlike most things I track, this one does not require a subscription.

What is actually happening

Strip out the mysticism and there are three things underneath, and all three are boring in the best way.

The first is purpose, which has better data than its reputation suggests. Hill and Turiano followed adults for fourteen years and found that people who reported a sense of purpose lived longer — independent of age, and independent of whether they had retired. The Ohsaki cohort in Japan followed 43,391 adults for seven years and found lower mortality in those who reported ikigai, adjusting for the usual suspects. Both are observational, so they show association rather than cause — but the association is there and it is not small.

The second is the inverse. Loneliness has been associated with differences in some of the markers we already pay to have drawn: IL-6 is the most consistent inflammatory signal, while CRP and TNF-α are less consistent, and living alone has been associated with a flatter diurnal cortisol slope. These are observational associations — not a diagnosis, and not a basis for a protocol. But the thing people file under soft does have a paper trail.

The third is the one I notice most clearly in my own life, and it is almost stupidly simple: they change what I do all day. I move more, because moving is the price of admission. I eat at fixed times, because they eat at fixed times. I get up on a schedule I did not choose. I go outside on days I would not have gone outside. None of that is energy transfer. It is a structure I cannot negotiate with, wearing a Real Madrid shirt.

The comedy of being the oldest

A few things nobody warns you about.

Your recovery becomes a public metric. I track HRV and sleep, but the more accurate instrument is a nine-year-old asking why I am walking like that. He is not being unkind. He is genuinely curious. It is worse.

You will lose on stamina. I may start with the better plan; I still cannot outlast them. There is a specific moment in the fourth hour of something where I can feel the physics turning, and they can smell it.

And nothing you do is impressive. Not the training, not the bloodwork, not the discipline. The eleven-year-old considers all of it a mildly eccentric hobby, roughly on the level of collecting stamps. This is excellent for you. Every longevity subculture I have ever seen curdles the moment it stops being laughed at, and there is no danger of that here.

The part I cannot measure

I track sleep, HRV, resting heart rate and bloodwork. None of it captures what this article is about.

What I can say is narrower. Around them my days feel denser and the weeks blur less. Whether that comes from novelty, attention, or simply more distinct events per day, I do not know — the evidence on time perception is too thin to say. Subjectively, it makes time feel slower.

This one is four people, a balcony, and a video where I claimed to be 24.