In my 20s and 30s, I spent a lot of my free time working on side businesses. Despite some success, they never really worked out for me. I don't regret the time

In my 20s and 30s, I spent a lot of my free time working on side businesses. Despite some success, they never really worked out for me. I don't regret the time I spent as it made me a much better developer. The only negative is that I feel like I worked enough in my life and don't have the energy for side projects anymore. I tried, it didn't work, but that's ok. I read about how most founders don't succeed until their 40-50s, and I think "wow, now is my time!" I don't really have the energy for it. I get good sleep, I exercise, and feel great, but working nights and weekends isn't for me any more. I've been there, tried that.