With age comes responsibility. Perhaps that is why you don't want to grow up, just like Peter Pan?
I'm looking forward to getting older. The older I get the more I like it. I get confidence, wisdom, experience, more happyness, better computer games, better credit rating, deeper love, grey hair (I found another

, looks like I will go silver at the temples), satisfaction, life well lived. Not that I am not living in the moment. I love having a relatively youthful body and using it.
I don't think I have any age dysphoria. Though now that I have come out and get to express myself I am feeling like a teenager again, which is weird in the context of my 30's body.