young-old
n.— «What’s to get hepped up and festive about when all I can see in front of me is a decades-long campaign of vigilantly keeping the forces of decrepitude at bay as I totter forward over the next 15 years into first the demographic embrace of the ‘‘young old” (the oxymoronic term coined by the gerontologist Bernice Neugarten to demarcate the age group from 65 to 74).» —“Keeping the Forces of Decrepitude at Bay” by Daphne Merkin New York Times May 2, 2004. (source: Double-Tongued Dictionary)
Further reading
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Have you ever googled your own name and found someone else who goes by the very same moniker? There’s a word for that: googleganger. Plus, the language of hobbyists and enthusiasts: If you’re a beekeeper, perhaps you call yourself a...