I support eliminating mandatory retirement at for airline pilots at age 60.  I'm not convinced that age 60 was the appropriate age when it was established in 1960, but certainly spectacular advances in medical technology and practice, increased longevity, and greater awareness of healthy practices make today's 60-year old significantly "younger" than the 1960 version.  The argument that those now clamoring for a change "knew what the rules were when they signed on" does not seem relevant to the question of age discrimination to me.  That's like arguing to continue a discriminatory practice because it would be unfair if the group that formerly benefitted from the practice no longer did so.  Age discrimination is wrong.  Those who can still meet the FAA physical requirements and pass their checkrides should be allowed to continue past age 60.        
