The Sydney Carter song : "Silver in the Stubble" hasn't been mentioned yet. (In the DigiTrad):
"For the leaves are getting greener,
And spring is on the way,
The girls are getting prettier
And younger every day"
The people I used to hear singing that song around 30 years ago really *are* of that silver-in-the-stubble age now !
"Sunrise, Sunset" has already been mentioned - and there's another lovely, lesser-known one that Golda and Tevye sing in 'Fiddler on the Roof': "Do you love me ? - do I WHAT ?" Always brings a tear to my eye.
And how about "Old Friends, sat on a park bench like bookends", Simon & Garfunkel..."Can you imagine us, years from today, sharing a park bench quietly. How terribly strange to be seventy." I remember my cousin and I listening to that when the song first came out, in our early teens, and yes, it did seem a terribly strange thought. We both said we'd remind each other of that when we *were* seventy. Not quite such a strange thought, now...