1) Aarp member among others 2) Adult 3) An elderly person 4) Centenarian 5) Elderly one 6) Elderly person 7) Frequent Brennan role 8) Golden ager 9) Grandpa, possibly 10) Graybeard 11) Grownup 12) Many a retiree 13) Methuselah 14) Nonagenarian 15) OAP to sort LED out 16) Octogenarian 17) Old person 1) Curmudgeon 2) Dodderer 3) Dodo 4) Dotard 5) Fogey 6) Fogy 7) Graybeard 8) Greybeard 9) Septuagenarian 10) Vet 
• (n.) An old person.
Old'ster noun [ Confer Youngster .] An old person. [ Jocular] H. Kingsley. 
Oldster is slang for an old person.
[n] - an elderly person
old person noun an elderly person