Synonyms for Senior citizen:

• adj.

  •aged (adjective)
  • over the hill,
  • timeworn,
  • ageold,
  • been around,
  • senescent,
  • creakier,
  • worse for wear,
  • creaky,
  • oldie.
  •old (adjective)
  • aged.

• n.

  •
  • centenarian,
  • ancient,
  • the aged,
  • the elderly,
  • octogenarian,
  • youth,
  • the old,
  • methuselah,
  • nonagenarian.
  •elder (noun)
  • fore bearers,
  • fore bearer,
  • oldests,
  • fore-bearer,
  • fore-bearers,
  • old fogeys.
  •golden ager (noun)
  • goldenager.
  •old person (noun)
  • old person.
  •Other relevant words: (noun)
  • old folk,
  • golden-ager,
  • pensioner,
  • senior,
  • retired person,
  • ancients,
  • grand-mother,
  • oldtimer,
  • doyens,
  • grand father,
  • firstborn,
  • golden-agers,
  • golden ager,
  • doyen,
  • veteran,
  • elderly person,
  • old fogey,
  • elder,
  • doyenne,
  • grandmother,
  • oldster,
  • first-born.
  •senior (noun)
  • first-borns,
  • old timer,
  • grand fathers,
  • grand mother,
  • grand-father,
  • firstborns,
  • retired people,
  • elderly people,
  • elderly persons,
  • old folks,
  • first borns,
  • grand mothers,
  • first born,
  • grand-mothers,
  • retired persons,
  • grand-fathers,
  • goldenagers,
  • doyennes.

• Other synonyms:

  •
  • old-timer.
  •Other relevant words:
  • OAP.
  •Other relevant words (noun):
  • graybeard,
  • geezer,
  • wrinkly,
  • old-age pensioner,
  • ancestor,
  • sexagenarian,
  • old man,
  • old codger,
  • old chap,
  • old dog,
  • geriatric,
  • pantaloon,
  • older person,
  • old woman,
  • septuagenarian,
  • gaffer,
  • nestor,
  • dotard,
  • Grandsire,
  • gramps,
  • retiree,
  • patriarch,
  • grandfather,
  • older,
  • presbyter,
  • old duffer,
  • old geezer.