fit

"Look at ME!" boasted the fit old man to a group of young people. "Every
morning I do fifty push-ups, fifty sit-ups, and walk two miles. I'm fit as a
fiddle! And you want to know why? I don't smoke, I don't drink, I don't
stay up late, and I don't chase after women!"

He smiled at them, teeth white, eyes glittering, "And tomorrow, I'm going
to celebrate my 95th birthday!"

"Oh, really?" drawled one of the young onlookers, "How?"