If you’re anything like me, you’ve probably watched the ups and downs of your Trading 212 Stocks ISA with equal parts fascination and frustration. It shows two key percentage figures:
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Your overall return — how much your portfolio has grown or shrunk since you started.
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Your daily or recent performance — how much you’re up (or down) right now.
The first tells you the destination. The second shows the direction of travel.
And it struck me — this is almost exactly how healthspan tracking is evolving too.
Introducing: Pace of Aging
In longevity science, we now talk not just about Biological Age — a snapshot of how “old” your body is internally — but also something more dynamic: your Pace of Aging.
Just like that daily performance stat in your ISA, Pace of Aging shows whether your current lifestyle is speeding you toward (or away from) chronic disease, fatigue, and decline.
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Pace = 1.0? You’re aging at a normal biological rate.
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Pace > 1.0? Uh-oh — your habits are accelerating the clock.
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Pace < 1.0? You’re literally slowing down the biological wear-and-tear.
Stocks Meet Cells
Let’s bring the analogy full circle:
| Finance | Longevity |
|---|---|
| Total return since investing | Biological Age |
| Daily movement / recent trend | Pace of Aging |
Just as a red number in your portfolio can make you rethink your investments, a rising pace of aging might nudge you to get better sleep, take that walk, or rethink your stress habits.
Where Does Rejuve.AI Fit In?
Here’s the thing: while Rejuve.AI doesn’t yet explicitly use the term Pace of Aging, it does show something very close.
It shows:
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Your current biological age
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How it compares to your chronological age
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And whether it’s changed since your last reading
That change from the previous calculation is effectively a sneak peek at your personal aging rate. If your biological age is going up faster than your calendar age — that’s Pace > 1.0. If it’s holding steady or dropping, you’re trending in the right direction.
So while Rejuve.AI doesn’t label it this way (yet), it’s already nudging in the direction of time-based insights that go beyond static snapshots.
What’s Next?
While Rejuve.AI doesn’t yet include a full Pace of Aging feature, the current system already lays the foundation for it — tracking changes in biological age over time. As the platform evolves, we may see more longitudinal insights and dynamic feedback emerge, especially as user data and AI models mature.
Rejuve’s approach remains centered on putting health data in the hands of individuals — not Big Tech — and that ethos opens the door to more personalized, responsive longevity tools in the future.