Late 30's here with two young ones. I was essentially retired by my late 20's (I wasn't rich, but I didn't really have to work and mostly did what I wanted) and honestly, it got old. I wasn't able to travel the world, so I ended up just going out a lot and socializing. Lot's of concerts, dinners, movies, etc. I'd sleep in everyday and stay up late playing videogames or going to the bar or whatever I felt like doing. It was a lot of fun, but after a while it felt empty. My longtime friendships were waning, as they often do with age, and I found myself with a lot of time to fill. Went back to school to try and find my calling/accomplish something meaningful, but that only lasted a few years until I realized a career wasn't what I wanted. I continued to float well into my 30's until Surprise! - my partner got pregnant. I never really considered having children because I didn't think I was cut out for it, but 3 years in and I hardly remember my life without my kids. For me, it's the single greatest thing I've done. But most parents say stuff like that, and most people without kids say they love their freedom, etc. I've been in both camps and I'm thankful to be where I am now.