Also there can be noticeable differences in your body in your 30s compared to in your 20s. Maybe you get hangovers now from the same amount of alcohol you drank without consequence ten years ago. Maybe your knees creak. Maybe climbing over the fence sounds like more of a hassle than the adventure it used to be in your teens.
Or maybe you just wake up and realize that when your mother was your age she had six anniversaries and a kid already and you feel really fucking behind the times.
