I am considering doing a Phd in a completely unrelated area when I turn 50 (45 now).

Is there anyone in this thread done a phd that late? Obviously my motivation is different now to study - to really learn the subject. I am financially self sufficient and will continue to be, and hence making a living out of my phd is not a consideration.

Edit: I would like to be able to study in a university setup (not distance education). Main reason is to soak in all the related conversations / workshops and also I like being in a young environment.