If you throw some data at a clustering algorithm, the clustering algorithm is guaranteed to give you clusters back. So I'm not convinced about the results suggesting a precise pattern of rapid aging.
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Anecdotally I feel I noticed a very fast ageing speed between 38 and 40. Suddenly got white hairs, feel more tired, more wrinkles, way harder to keep VO2max up (I run a lot), muscle sores after training suddenly lasting up to 3 days instead of 1, face looks older, etc.
I feel like that all happened real fast around this age.
It's like there's two versions of me now, the one who was somehow moderately fit by biochemical decree, with a healthy amount of flesh to his face, voluminous dark blonde hair and a pleasant complexion...
... And the grey haired, weathered, lined, dessicated mummy I see in the mirror. I love my kids dearly but the constant caring really takes something out of you. That and the whole getting older thing in TFA.
I keep telling myself I'll get a gym membership soon to reclaim some of my dignity.
The kids still need lots of care (they are 5–9 years old), so finding time and motivation is still a challenge. For me the trick is to do training I really like. That helps so much with motivation. So, find something you like!
What I happen to like is bouldering and hiking. I have a fixed day of the week for bouldering, just after work, and I never miss it, because I know if I start skipping I might fall off my training habit.
Then the rest of the training is motivated by getting better at what I love. I do pull ups to better my climbing etc…
I will fight hard to keep at it through my 40s, because it is such a quality of life improvement. I also attribute the fact that I haven’t been really sick the last few years to my exercise.
The oldest go to bed later and later & I also like to hang out with my wife for a few hours each week... finding the energy and motivation for "me time" has been tough indeed. I should just do something I like, and stick with that on a regular schedule. It's as simple as what you write.