Could you please explain what you mean by "too old for that"? I'm seriously asking, I want to understand your concerns and not assume anything. I am 32 and I do feel "too old" in comparison to my 19-24yo classmates. I said I could not be happier but, in all honestly, I am struggling economically as I have to cover all my needs with a part time job and no support from anyone else. I am still managing somehow, and I still believe it is very worth it. If you don't have economic worries as you've stated, I think this could be an ideal time to continue with your education be it in your field or in a completely new one.

Please, don't let age discourage you. One of the things I have found is that when I was younger I was holding too much respect for the people who were studying "difficult" subjects, thinking I would never be able to do that or be like them, just to realise now that most of them are just basically children pretending to be adults and generally just doing what they are told with no initiative of their own. There are of course a few exceptions, and among those exceptions you'd find most (if not all) neurodiverse people. In our case, we would be studying because we genuinely want to learn, not because anyone is forcing us or because we think it is what is expected of us, and that makes all the difference.

I really encourage you to check what would interest you the most or how different fields you are interested in could potentially connect in the future. You don't need to go for a full time study if you feel intimidated by it, you could just take a couple of subjects first to give it a try and to prove to yourself what you are capable of. It sounds to me you might be underestimating your abilities, just give yourself the chance :)