pensioner; annuitant
Refers to a person who receives a pension, typically an old-age pension. Neutral, formal term used in official contexts.
Pensioners must submit a status report every year.
With the aging population, the number of pensioners is increasing.
年金生活者 emphasizes living on a pension as one's main income, while 年金受給者 simply means a recipient of a pension, regardless of whether it is the primary source of income.
Compound of 年金 (pension) + 受給 (receiving benefits) + 者 (person).