This is the 2413th most frequent Russian word.
пенсию
"Pенсию" means "pension" in English.
The word 'пенсию' here is used in its primary meaning as 'a pension', referring to retirement payments.
Она начала получать пенсию с шестидесяти пяти лет.
She started receiving a pension at the age of sixty-five.
'Пенсию' refers to the pension that one plans or expects to receive in the future.
Я коплю деньги на будущую пенсию.
I am saving money for my future pension.
This use of 'пенсию' implies the act of retiring, as in leaving one's job after a long career, which is closely associated with starting to receive a pension.