I'd love to feel so many things again as if it were the first time.
The first kiss of a woman, the feel of her, the awesome feeling when she got naked!
The first drive in my own car, my first time peeling out, my first engine swap.
I don't "try" to think in an immature manner, it just happens.
Growing up, I used to see dudes that were mostly serious and it seemed really sad. Most every older person I've known seemed to be either annoyed, pissed, disappointed, displeased or just plain unhappy. I don't know if that shaped me or if I were destined to be who I became regardless of my surroundings.
I pay the bills and always meet my responsibilities so from there, I don't see it as a bad thing to find humor in silly or inappropriate things.