Up to 18,000 mandatory retirements between now and 2022.

Another thing to remember is that this industry is very reactive and not very proactive. None of the majors think that they have a shortage of apps because they have X,000's on file but as stated above but actually it's the same X,000 people with apps out everywhere. Divide that number by at least 3 and that is the true pool they have to choose from.

Pilot shortage a growing problem in regional air service: Travel Weekly