Hi,
I didnt learn to fly until I was 38. 9/11 happend just as I finished my ATPL exams. After my CPL/IR, I worked in a warehouse until I could afford an Instructors rating. After 18 months instructing and about 1000 hrs, I got a job flying a turboprop and now after 2 1/2 years at age 45 I have just been offered a job flying a 757. Incidently, I went modular because it was cheaper and schools like Oxford were quite rude about me starting at age 38.
Age makes it more difficult but the only barriers to a career are the ones you put up yourself.
All the above posts give good advice; if you can afford to live and pay for your training and be prepared for a hard slog then go for it - you can always go back to your old career if it doesnt work out but you cant turn the clock back in five years and say I wish I'd had a go at flying.
Very best luck
PB