[Haskell-cafe] PhD at age 45?

A more specific question than my last post. I guess I'm wondering if it's a good idea to begin a PhD in CS at age 45 (currently having a BS in CS). My goal is to obtain work that interests me, work that really draws on the skills one develops in a PhD program. Work in academia is hard to obtain, I understand, but I could take an industry job. I'm wondering if I'll just be postponing a job with no financial gain afterward and poor prospects for work. Or if there is ageism that will work against a guy coming out of school at age 52. Or, if it will truly lead to an interesting job with good pay. Dennis