I was recently offered a place on easyjet MPL and I'm in my mid/late thirties. Only point through the selection process that my age was even raised was at the very end, and it was raised by me not them, asking the EZY training captain doing my interview about his thoughts on later career changers. He was entirely positive, with all the usual lines about maturity, life experience etc etc. And I know of at least two others that started MPL in late forties/early fifties.
I know MPL is a bit of a different route to modular, but EZY certainly don't seem to care if you're a bit older.