an elderly person, especially one beyond the normal retirement age.
- 1957  Nowadays doddering derelicts (I'm one) are lovingly called Senior Citizens, with $46 a month for doing nothing.
- 1960  At the other end of the temporal scale we find the elderly subjected to the indignity of being called "a senior citizen." A senior citizen is somebody who is old and can't afford it. Better to be called "a dirty old man." At least you have color.
- 1966  The residents have no opposition to senior citizens units on the Land--"fill it full of senior citizens homes if you want."