Here's an idea, if we push the age to 70. All of the older pilots that feel that they are completely fit to fly, should have to undergo far more tests for their medical.
1. They should have to be cleared to fly by both their regular doctor and their aviation doctor.
2. They have routine blood tests to examine health (to find underlying diseases) and to detect hidden medications that the pilot is not disclosing to the FAA that are banned for use while in the cockpit.
3. They have to take a memory, dementia, Alzheimer and reaction tests.
4. These tests only apply after the age of 65.
If you pass this, you are good to fly. I know you're fit and it will be a pleasure flying with you.
If you think this is over the top and age discriminatory, wake up, the FAA is already testing you more and more as you get older. After a certain age you go from a 1st class medical lasting one year, to having it last 6 months. After 40 you have to take an ekg. The FAA is aware of aging and have done research, but they need to do more before they randomly raise the age limit to a higher number.
Heck, some states start putting restrictions on drivers after the age of 65 but no worries when they get into a high performance jet.
(plus, I'm aware that some of the older guys I fly with would love a higher retirement date because then they can punch out early on disability, suck money out of the company, and then retire. I have already heard stories of older guys keeping medical problems "in their pocket" until they need to use them. But then again, if we followed my three steps above, these guys couldn't hide their problems and they would be gone.)