I have not seen discussed here the following argument for starting SS earlier. By claiming early you prevent Medicare costs from rising more than the SS COLA. If you instead wait to start SS, you are exposed to uncapped Medicare increases, and in effect you end up paying for those who started SS sooner.
"And for those people aged 65-69 who are paying Medicare premiums but have intentionally deferred collecting Social Security in order to receive
larger payments later - they have no 'hold harmless' protection. What is much worse, however, is that they must 'pick up the tab' for
everyone who is protected by 'hold harmless', including those in their age group who did choose to collect Social Security."
The full text is wordy but presents interesting arguments. http://danielamerman.com/va/BenefitAge.html
"And for those people aged 65-69 who are paying Medicare premiums but have intentionally deferred collecting Social Security in order to receive
larger payments later - they have no 'hold harmless' protection. What is much worse, however, is that they must 'pick up the tab' for
everyone who is protected by 'hold harmless', including those in their age group who did choose to collect Social Security."
The full text is wordy but presents interesting arguments. http://danielamerman.com/va/BenefitAge.html