Do you intend to live a fairly frugal lifestyle for the rest of your working life or do you have financial independence and are just looking for something to give meaning to your life?
Getting an airline job at your age, I would imagine, would be nigh on impossible and even if you did you wouldn't be making much money as a FO.
If, on the other hand you think you simply might like to become a flying instructor then I'd get your PPL and then make your decision.