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Older people, typically retired, who are both fit and healthy. Used by the British parliamentarian Harriet Harman and disliked by some as political jargon that has become associated with raising the age at which retirement benefit may be taken.
From the Indpendent Newspaper:
Introducing the wellderly
Growing numbers of the over-65s want to keep working, volunteer or go on gap years
Antonym frelderly.
by Johnny Germane November 27, 2012