Everyone knows someone who must be lying about their age. After all, how can they look like that and have all that energy if they were as old as you?
After about 35 or 40, I’d say “the real you” starts to show, and it will typically go one way or the other. Some will almost hit the pause button, and they’ll look that age (or even younger) for decades, while in other cases, some start to look like someone pushed a fast-forward button. And while some of it might be genetic, a lot of it is lifestyle.