It's annoying to hear someone say "I'm seventy years young," when he means "I'm seventy years old." Whenever I hear this expression, I'm reminded of Shakespeare's Henry IV Part II
Do you set down your name in the scroll of youth, that are written down old with all the characters of age? Have you not a moist eye? a dry hand? a yellow cheek? a white beard? a decreasing leg? an increasing belly? is not your voice broken? your wind short? your chin double? your wit single? and every part about you blasted with antiquity? and will you yet call yourself young?