The supposed reasons the FAA mandated (and maintains) the retirement age of 60 has to do with an increased possibility of sudden incapacitation and deteriorating skills. In all the discussions on this site that I have seen in the past though, it has always been about money and advancement to the left seat. Frankly, it makes me sick that ALPA is now considering supporting extending the age limit - because of personal finances. What hypocritical baloney.
I was forced to retire last year at age 60 and it really irritates me to no end because it had nothing to do with my flying skills and I am in excellent physical condition. I WANT to continue to fly - I actually like it!
There always seems to be a lament by someone "I don't want to fly past 60." Well quit, dammit! You have that privilege at any age. Allow us that want to fly to continue.
I got lucky and found a position overseas where they allow flying to 65, fortunately.