If you could hav
e met my mom. 90 years old (5 months shy of 91) when she died a year and a half ago. Lived on her own (second floor) apartment, still drove, and pretty much to the end would go out to late dinners with us or even friends her age. Saturday nights were for the local pub and dinner, drinks and dancing.
NG had her Saturday night out with her family, and stayed overlong presumptively because after dinner involved game playing. And, since they lived close by, this could have been a regular thing. I see no reason for a bedtime stamp on older individuals. They all vary and mange what they’re able. Again, my mom normally stayed up later than I do most nights.