How Old Do I Have To Be To Get Medicare? 
Most people sign up when they 're turning 65 - this is your initial open enrollment period . It starts the 3 months before the month you turn 65 through the 3rd month after you turn 65 . If you 're outside of this window , you will have to wait to sign up until the general enrollment period opens up for Part B -LRB- January 1-March 31 of each year -RRB- , unless you qualify for a special enrollment period . Other situations where you can be eligible for Medicare are if you 're under 65 and on social security disability -LRB- need to be on it for at least 24 months -RRB- , or have end-stage renal disease . Please let me know if I can be of further assistance . Thanks very much . 