I don't know why:
The government changes common definitions of things we all accept. For example, when looking at your Social Security adjustments for taking payments early/late, I found this table:
Early or delayed retirement
Which very clearly spells out the various % of FRA payment based on the year you were born and the age you wish to take SS.
But "the year you were born"
has fine print. WTH? Why do we need fine print for "the year you were born"? Wouldn't that just be, well, gee, I don't know, just taking a wild stab at this, I'm not all that bright, but I'd normally assume that "the year you were born" would actually mean "the year you were born". No?
Note: Persons born on January 1 of any year should refer to the previous year of birth.
Roughly 1/365 people are born on Jan 1 - if you asked them what year they were born, would they ever think to refer to the previous year of birth?
And what's with "the year after you turn 70 1/2" (RMDs). Isn't that the year you turn 71 1/2?
Are they just messin' with us? Like SS and RMDs aren't already complicated enough?