I am 42. CPL/IR FI MCC and 1000 hrs. Still no airline or air taxi job but enjoying instructing. Trouble is I am skint and owe thousands (via modular training over 2-4 years). Regrets? Only wish I had done it earlier.
It was the right thing to do for me (had been drifting for years until now)..but not something to be undertaken lightly (costs years of your life and at least £40k). You will know if it is the right thing for you to do...you'll have no choice!
Most qualified wannabes I know are 'driven' and would not change a thing. Most of the drop outs I know have been graduates of integrated courses or people who cannot get past the ATPL written exams. Older self-improvers (modular types) tend to be highly motivated...juggling real life with flying.....aaahh if only the airlines appreciated that!
Short answer? If I never get an airline job... I still do not regret the investment in time and money.