[{"born":"1943-1954","years":66,"months":0},{"born":"1955","years":66,"months":2},{"born":"1956","years":66,"months":4},{"born":"1957","years":66,"months":6},{"born":"1958","years":66,"months":8},{"born":"1959","years":66,"months":10},{"born":"1960 and later","years":67,"months":0}] years and months of age (2026, from 2026-01-01) verified 2026-10-31 fresh https://www.ssa.gov/benefits/retirement/planner/agereduction.html; next expected change 2027-01-01