We used to think that aging was more of a continuous, gradual process, but turns out it's not.

So the first age when we see a major biological shift and this is absolutely mortifying to me is 34 years old.

The second is 60 years old, and the third is 78 years old.

Now we don't exactly know why this happens.

But what researchers have found out is at those ages is around 1300 proteins in the blood that suddenly change.

So up until 30 for the relatively stable and consistent.

And then there's a big change and then between 34 60 it's consistent again.

And then another big change and the same goes for 78.

In fact, scientists are able to predict people's ages within a few years just by looking at their blood.

And the only time that really got it wrong is when someone was particularly healthy for everyone else who is also about to hit one of those years, get ready.