I feel like life is shit in general, regardless of age. The reason youthfulness seems better to me is the lack of understanding how the world really works. Joy can be had at any age though, I find more joy today than I did as a kid. I’m 42 and just got back from the skate rink with my daughter and wife and we all had huge smiles and fun the whole time. There’s always moments of shit but also of happiness. What you focus on determines how you feel IME.