I haven’t seen an updated retirement list in years but the last one shows 20-30 pilots retiring each year for the next 10+ years. Yes, they hire from all age brackets, to include some over 60 and some in their early 20’s. Current upgrade times are more driven by growth than retirements, due to 330 freighters and 787’s. ~6 months for 717CA, ~3.5 years for 321CA, and ~6 years for 330CA. Those will all likely continue to come down some in the near term, unless they don’t, cause you never know.