I feel this is more dependent on geographical location, not age.
When I was younger (last teens through my 20s), I really didn't like uncut cock. But that was really only bc in this country, the majority of men are cut, so that is what you get used to.
Then I moved to the UK in 2010. Pretty much everyone in Europe is uncut, (minus Jews and Muslims), so I started to get used to it.
At this point in life, I really do not have a preference. They all look the same once hard anyways.
My only requirement is to keep it clean please, fellas!