I think that as people get older, there is less need to "fit in".
When you are in your teens and twenties, a lot of your energy is spent on trying to "make it" - to establish yourself, to build a reputation, to grow a career, to make friends and build a social network. And there are aspects of our selves which we suppress because we feel that they won't be widely accepted, that they may hinder these goals. You push them so far down into your unconscious that you are hardly aware of them.
After that comes what I call the "age of peak responsibility" - the thirties and forties where you have no free time, you have so many commitments to job and kids and friends that you don't have the time or energy to think about self-development or introspection.
But by the time you have reached your fifties, all those suppressed aspects of yourself, those things which you've kept hidden for too long - they start to clamor for attention, the pressure builds and you find yourself with these odd dreams and desires, and you wonder what's wrong with you, where this stuff came from. And you also realize that perhaps you don't care so much about what your friends and neighbors think, and so you start to experiment - what happens if I let them see *this*?