I was in your exact position 10 years ago. 30 years old, finally realized I wasn't going to be a rock star and no good career prospects. It took me 6 years to work my way through school, but when I graduated I already had a job through an internship, and now I'm still at the same company making more money than I could have in just about any other field with the same amount of experience. If you think computer science is interesting, then go for it.
I was in your exact position 10 years ago. 30 years old, finally realized I wasn't going to be a rock star and no good career prospects. It took me 6 years to work my way through school, but when I graduated I already had a job through an internship, and now I'm still at the same company making more money than I could have in just about any other field with the same amount of experience. If you think computer science is interesting, then go for it.