Funny to see someone asking this kind of question in this era... oh wait, yeah, it's called peer pressure when someone is forced to let go of something he like because of his/her age.
It's the same like those weird baby naming website who can't acknowledge a 50 years old is named Ethan, they think names have to fit their age? so people have to confirm to others believe by doing/leaving things he have/likes?
Let say you love to collect stamps at age 20, then you turned 40, people start peer pressuring you to change your long time hobbies with something they think is appropriate with your age, like owning a yacht and sailing around aimlessly, then when you hit 60 people start peer pressuring you again to change to another hobby collecting antiques? then you're not you, you just a projection of others expectations, and projection is always empty inside.
Do what you enjoy, stand up for what you believe, I've seen and heard people that love to peer pressure others because they think they know what best for that certain someone, and if someone is try to resist then they will get a social punishment of being shunned, we're a social creature, I prefer to call this people who shun others because they won't conform to their expectations as social monsters.