Waiting until 70 produces bigger nominal checks — but those checks arrive years later, when each dollar buys less and when you have fewer years to spend it. Below, every claim age is restated in today's dollars using your 5.0% discount rate.
The two answers disagree.
On paper, age 69 wins. In today's dollars (your money's true buying power), age 62 wins. The faster you discount the future — higher inflation, higher expected investment returns, or shorter health runway — the more attractive claiming earlier becomes.
The "go-go years" lens
Most spending happens between 62 and 75 — travel, family, the active half of retirement. Claiming at 62 puts $305,231 into those years. Waiting to 70 puts $187,714. The bigger check at 70 only matters if you live well past the break-even age and don't regret what you missed doing earlier.
How to read this: PV discounts each future check back to age 62 at your chosen rate. Use 0% to ignore time value entirely (just inflation-adjusted dollars). Use 5–7% if you'd otherwise have invested the money. The honest answer is somewhere in between — and it's why "always wait to 70" is too simple.