im doing for parents. mom/dad at 57. she asked if retiring at 65 is better cuz it was a higher monthly payment. i told her we shall try for 62 cuz a bird in hand is worth two in bush!
anyways she sent me her numbers. i actually didnt use numbers above btw but the personal numbers she gave at 62 67 and 70.
my conclusion is retiring early is best from an npv standpoint. but again she prolly needs 1m in assets which barring a recession is doable. but a recession will very likely hit us within 5 years so, we shall have to play by ear.
she also is a cancer survivor so her expected age is prolyl lower. so health is a big thing when figuring whether to take early retirement. but the nest egg will also be used to take care of my no income dad. so that acct needs to be done bigly otherwise my siblings will have to shoulder the costs.