I jacked in a 20+ year IT career to go to uni, aged 44 (I'm also single and childless). Uni was unfinished business from my younger days and I just decided that if I didn't do it now, then I never would. I had the additional advantage of having paid off my mortgage early.
I loved uni. I completed my undergrad, then found I had enough savings left to do a Masters. I was into the third year of a PhD before stuff went expensively wrong and I had to stop.
There's no way to be sure how things will go for you. All I can tell you is that seven years on, I've never regretted leaving my job and going to uni. I'd do my undergrad degree again in a heartbeat.