Meh. I have a degree in sleeping. 10 hours per night most of the time, no matter what time I go to bed—usually between 9:30 and 11.
Actually, I think it’s irrelevant. Best indicator of living to be 100 is muscular strength. Lift weights, you’ll be fine. My doc says so.
Since I started going to school and then work it was always around 10pm. I am now retired and on my first week I have gone to bed at 2am or 3am... and spent 8 hours in bed with only waking up a few times then nod off right away. I do not know if I will keep that schedule as you miss the morning.
My sister says she goes to sleep around 10pm but wakes up around 1-2am and may stay up for a few hours then goes back to bed.