senior citizen
US /ˌsiː.njɚ ˈsɪt.ɪ.zən/
UK /ˌsiː.njɚ ˈsɪt.ɪ.zən/

1.
idoso, sênior
an elderly person, especially one who is retired and receiving a pension
:
•
The museum offers discounts for senior citizens.
O museu oferece descontos para idosos.
•
Many senior citizens enjoy community activities.
Muitos idosos desfrutam de atividades comunitárias.