When does senior citizenship begin? You can join AARP at age 50. Senior discounts start around age 55. You can retire with full Social Security benefits at age 67. You hit platinum senior status when you can say and do anything you want, without tarnishing your livelihood. So whatever your senior status may be, grab a mug of coffee (or tea). Open eyes wide. Observe and see. Have fun. Be useful. Be woke. Be free.