After a childhood of being fascinated with pants wetting and other kids (especially girls) in diapers, I first started wearing and wetting my own makeshift diapers (usually the "towels and trash bags" thing) when I was about 12--and since then my diapers have been the primary way I get myself off. Yes, I had lots of girlfriends and tons of wonderful sex with them, but throughout it all I never completely gave up my diapers, incorporating them into my relationships whenever that was possible (not very often but it did happen a time or two). Then I married a girl who enjoyed having me as a big baby, now she's not as active with it but doesn't care if I continue to enjoy myself.
Did I enjoy it more then or now? Hard to say. During the early days it seemed to be much more deviant and "out there" as far as a fetish / perversion went, also way less common and accepted than today. For years, I truly thought that I must be the only person in the world that loved this and therefore must have been crazy--and thinking this and still doing it anyway was part of the excitement. In that regard, because of the newness of it and also a greater fear of people finding out and the associated turn-on from the anticipated humiliation, maybe in those ways it was better when I was younger.
On the other hand, as an adult I accepted that it's just part of who I am, I'm going to do it, I love it, and I'm increasingly less concerned with what anyone else would think if they found out. I've had all these years to try the various aspects of it and decide which I like to do (and a few that I generally don't). ABDL products and supplies are now everywhere and easy to find. And I'm married to a woman who knows all about it, accepts it, and doesn't care. So, in these ways it's better now that I'm older.
My only regret, now that I'm older, is that when younger I wasn't more daring about doing it in public and being seen, caught in the act, teased, laughed at and humiliated over it. At the time that possibility was terrifying. But now, anyone who would have seen me back then is now long gone from my life and I'd still be getting myself off with those memories when enjoying my diapers today.