There can be lot of IFs and BUTs. And if you are disappointed with something that you missed because you were doing something else then you are not alone. The entire world got the same story with them if we ask why they are not successful in their life.

Instead, you should focus on your future and that's what happened now, you might be old now but there is no agre barrier for investment and money. You can keep doing it as long as you want and finally remember this "Better Late than never".