I’m 49 and haven’t noticed much. I’m in better shape now than in my 20s and 30s so that could be obscuring things. It does take longer to recover from an all nighter at work than it use to so there’s definitely that.
I don’t sleep that well but am working on it. Ever since I had my first kid (15 years ago) the slightest noise or interruption in the middle of the night and I’m 100% awake ready to rock. I was the night duty parent for both kids so that’s where that comes from I assume.
In my 20s and early 30s I did a lot of drugs and was blackout drunk two nights per weekend. Having kids and a no nonsense/assertive wife put an end to that with the side effect of dramatically improving my health and career.