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Born on the 1st of the month? Your Medicare and Social Security dates move
Last checked October 5, 2026 against the official rules. Sources are listed at the end.
The law says you reach an age the day before your birthday. So if you were born on the 1st, you turn 65 in the month before your birthday month, and your Medicare window and coverage start a month earlier. Social Security also treats you as born in the month before.
Why the 1st is different
Under a very old legal rule, you officially reach a new age the day before your birthday. For most people that changes nothing. But if you were born on the 1st, the day before is in the previous month, so you "turn 65" a month early in the eyes of Medicare and Social Security.
Medicare
Example. Born June 1, 1962. You legally turn 65 on May 31, 2027.
Your sign-up window runs February through August 2027, not March through September. If you sign up by the end of April, coverage starts May 1, 2027, a month before your birthday.
If you were born on any other day, including the 2nd, your coverage can start the first day of your birthday month.
Social Security: full retirement age
Social Security also treats you as born in the previous month. If you were born on January 1, that means the previous year, so your full retirement age comes from the year before.
Example. Born January 1, 1960. Social Security treats you as born in December 1959, so your full retirement age is 66 and 10 months, not 67. You reach it in October 2026.
Social Security: the earliest month at 62
To get a check for a month, you must be 62 for the whole month. People born on the 1st or 2nd are 62 for all of their birthday month, so they can start that month. Everyone else starts the month after their birthday.
- Born June 1 or June 2, 1962: first possible month is June 2024.
- Born June 3, 1962: first possible month is July 2024.
This one is easy to get wrong, so check any calculator's answer if you were born on the 1st or 2nd.
See your exact dates
Enter your real birthday. We handle the 1st and 2nd of the month automatically.
Sources
- Medicare.gov: When does Medicare coverage start?
- SSA: Benefit reduction for early retirement (born on the 1st)
- SSA POMS RS 00615.015: How the day of birth affects benefits
- ssa.tools (independent site, not SSA): Extra rules for those born on the 1st or 2nd
This guide explains the general rules. It isn't legal, tax or insurance advice, and your situation may differ. Settled Years doesn't sell insurance or take commissions.