I know people who started at older ages and are airline captains now. It's not going to be easy, you will have to spend a lot of money and effort to get to a point where you are hireable but it is definitely possible, now probably more than ever. If it something that really burns in your blood, I'd say go for it. Airline hiring is currently at a high and very low minimums are required by many of them.
Also, check out
this thread on PPRUNE.
Good luck,
A. Fleminger