Many people over 65 are capable of maintaining active careers. For example, Ernstine Shepherd was declared the world's oldest bodybuilder when she was over the age of 70. A person should regularly consult with their physician to understand whether they are in good enough shape to maintain certain activities. There is no exact age which can determine whether a person can perform.
At 65 Joe Perry may not have the stamina or resistance he did in his 20s, but the fact is that he still loves what he does and people still want to hear him. Until either of those things change, he is not too old to play in a band.
While Joe Perry may have health issues that interfere with his ability to perform, it does not necessarily mean that he should be forced to retire. As an artist who has clearly made his living from doing something he loves he should continue to do what he loves for as long as he is willing and able.
Aerosmoth guitarist Joe Perry has been hospitalized after falling ill while playing with his other group, Hollywood Vampires. This is not an age-related affliction, so to say thhat 6 is too old for this career would be unjustified. I believe that if you enjoy what you are doing, and it is not harming anyone else then you should be able to do what you want. There shouldn 't be an age-limit on anything, except perhaps driving...