retired person; former employee; retiree
Refers to someone who has retired from a job or left a company, often used in HR or formal contexts.
There is a briefing on the pension system for retirees.
He is a former employee of this company.
定年退職者 specifically refers to someone who retired at the mandatory retirement age, whereas 退職者 can include those who left for other reasons.
retired person (at retirement age); retiree
Compound of 退職 (retirement, resignation) and 者 (person).