I read Bang and Day Bang in the early 2010s. I was coming up on 30 years old when I read those books. I liked Day Bang better because at the time, I had wanted to shift more of my game towards non-bar venues. I've never liked staying up super late to get laid. When I was in undergrad, I would stay up late at college apartment/house parties and bars when I turned 21 to get attention from the women. I didn't do a lot of day game on campus while in undergrad. I wish I had a resource like Day Bang or the London Daygame Model in my arsenal when I was in undergrad. Anyway, Day Bang gave me a foundation for doing day approaches, especially in grocery stores. Day Bang advocates for a more indirect model, which I think has value in certain circumstances. As I got more advanced in approaching, I felt more into direct game. Sometimes, when doing indirect approaching, the women can be confounded and confused by the approach. It doesn't happen much, but it happens enough to be annoying. This can happen with Millennial women, who are more accustomed to fielding app swipe approaches than actual real life approaches. Without Day Bang, I would not have made the shift to mainly daygame as I approached 30. Day game is more sustainable than fighting it out in the bars night after night.
I read Game when it came out as well, but didn't find it as useful as Bang or Day Bang. However, if I had been new to approaching and seduction when Game came out, I would have found it quite useful.
Roosh totally lost it when his sister died. He did a complete 180 from his red pill and black pill points of view.
I think you can keep up a lifestyle into your 50s and 60s. That's why you switch more to day game. Day game can easily be done later into life. Around 30, I understood the transience of romantic relationships and realized that I would probably need something more sustainable. I can see situations where a guy could approach women in the grocery store as a 60 year old.