Beatin' the bushes:
“Part 121 airliners will not hire pilots over 65 because of federal laws. But, I was assured,
they are hiring ATP-qualified pilots in their late 50s and early 60s. 'If you left aviation 20 years ago because of that lost decade, it’s time to come back,' declared Air Wisconsin Director of Pilot Recruitment Timothy Genc.

One regional airline recruiter told me that
they had recently hired pilots in their mid-50s with the minimum requirements to start airline transport pilot certificate training—and the airline will reimburse their costs of earning the ATP.”
https://www.avweb.com/features/caree...rement-career/