Here's an interesting passage from James Clavell's novel Noble House. It involves Hong Kong's Haklo people, "the boat dwellers - who lived their lives afloat, were born afloat and died afloat."
"How old are you, Pockmark Tang?"
"Sixty - perhaps seventy. Almost as old as you are." Haklos did not have permanent records of births like all village land dwellers. "I don't feel more than thirty."
Wouldn't it be interesting to not know your exact age, and to estimate it mainly on the basis of how you feel? I don't know about you, but I think about my age all the time - 47 going on 48 - and to an uncomfortably large extent it defines how I think of myself and what my future prospects are.
To be free of all that - to not even know your true age, or care - must be very liberating. It almost makes me wish I were a Haklo.
But alas, I get seasick.