Here in Germany, as an employee, you pay in a pension fund. currently pension starting is 65 years old, word is, they wanna change that to 67 or even 70. how should I survive 5,7 or 10 years ? And maybe, Mr. LHR rain, you cannot imagine this, but THERE is a bunch of guys that are not with the flag carriing Airlines and their pension schemes.
A very close relative of mine was flying commercially until 68 and was the most capable pilot I met until now (15 years / 6300 hrs) to the last day.
Personally I haven´t seen such a study and even then I would doubt it - compare the elder people of today and their "forerunners" - healtcare and good living conditions at least at the developed world show an impact - thats why people getting older and older...
regarding the topic, maybe you can get a job on a privatly operated A/C ? Then you´re okay beyond 60...