The change from mandatory retirement age 60 to 65  hurt many upgrading pilot jobs with the associated pay increase. Many jumped off the aviation track and found jobs with a future and improving pay.  They are still out there and might like to enjoy the flying job again.  The pay needs to match the profession. 

There is a movement to change retirement to 67...  This would only hurt more pilots again and just kick the shortage down the road.  I am aware of an ATP pilot making 100K per year, however employed as an RN.  The shortage is in the paycheck.