Out today on an ebike, yesterday was a <~1/2hp motored pedal bike, tomorrow the ski slopes (with son). Life is good.

my question unanswered in 2 consecutive days of cycle deliberations: If those of us with 7 decades (and extra years, too) behind us = Why aren't we octogenarians? Same in years, 72 completed makes me feel 73 the next day.
Who can say? Reject inconvenient convention.