Chaps,
I took the plunge nearly three years ago, aged 44, after 25 years working in the banking industry. I've now got my fATPL and whilst I'm not working for a carrier (at least yet...), I'm flying every day, building hours, getting paid a modest salary and, more to the point, enjoying every chuffing minute of it
It's never too late provided you know what you're letting yourself in for (i.e. in terms of what you need to do to get there), you get a slice of luck along the way, you're prepared to network like crazy and you're realistic about who you may end up working for at the end of it. This industry is notoriously cyclical, and whilst it's looking pretty bleak at the moment, the likelihood is things will start to improve in the next 12-18 months, so you may be starting out at a good time.
Good luck
HW