Zero to ATPL at the age of 35?
There was a gent who started with my company at 40...buuuut I must also say that he had been doing a LOT of flying before that as a parachute 'plane pilot.
Good luck if you choose this path though. You will be looking at a couple of years before you are employable (fATPL etc), and you would be fighting a lot of furloughed people and other low-houred pilots.
I am sorry for being so negative in my answer but it really is a tough market now.