My two or three cents worth:
Age is a unit of measurement to gauge our relative success at remaining vertical and moving forward in the great and mysterious game of life. The number, high or low, is neither good nor bad. It is simply a unit of measurement.
I consider myself like a finely engineered Italian or German automobile, albeit with certain manufacturing oddities or defects. The number on the odometer is a relative measurement of age and use. I try to take care of myself and receive regular check-ups, etc. So, using the car metaphor, I am a classic...heading to be an antique, but still drivable...
The debate insofar as this thread is concerned seems to be about the disconnect between hair color and apparent physical condition. It is very common on the Camino, to see grey or white haired pilgrims who are in remarkable physical condition, FOR THEIR APPARENT SENIOR STATURE. Clearly, this is one reason the Camino works for them...
In many cultures, more senior, grey or white haired people GENERALLY are sedate and infirm folks who are waiting to be called to their eternal reward. Whereas in North America and Northern Europe, seniors remain very active well into their light haired years, this is not totally the case farther south. Again this is a general statement based on observations.
Don't believe me, well, how do YOU react when you meet some older person in Spain, Portugal, Italy or France, like a white-haired woman dressed in a long black dress, or bristle-bearded scruffily dressed, bowed over man with a cane, who turns out to be younger than you? Tell me you have never compared yourself to someone like this and thanked all the gods and your lucky stars that you took care of your health and physical well-being? Wanna bet that doing the Camino factored into your recipe for longevity...?
I suspect that is what this impertinent or inappropriate questioning by complete strangers is all about. I think the person asking is confused, curious and amazed with the results they frequently receive. Your evident condition and behavior simply does not compute as compared to their cultural / societal context. It is like two teenagers tittering back and forth when viewing something saying "no way...way...no way...!"
When I am asked, and I am, I usually tell them the straight out truth...65 (and counting). Most folks are surprised. I am told I do not "look" that old." Well, let me tell you, 10 days after a recent surgery, shortly after returning from my six-weeks in Spain at the end of August, I certainly feel at least that old.
However, in general, I do not feel THAT age, whatever that is supposed to mean. I certainly try not to think and act "that old" (again whatever that means).
Mostly, when asked, I simply tell folks that "I am old enough to know better, but young enough not to care...
"
Hope this helps.