The opaque "optimal claim age" calculators give you one number and a sales pitch. We built this because the claim-age decision is the single largest one-time financial choice most households will make, and the math is actually simple — ~6.67% per year reduction from 62 to FRA, 8% per year delayed-retirement credit from FRA to 70. We show the benefit at every age, the lifetime cumulative at your longevity, the breakeven year against every earlier claim, the spousal optimization (claim early on the lower / delay the higher), the WEP/GPO post-repeal flag, and the provisional-income taxation thresholds.