AS SOON AS POSSIBLE…!
There are benefits to purchasing your Medicare Supplement plan as soon as you can, the number one reason is peace of mind, the second reason is you can normally lock in your rates with the carrier. The longer you wait the better the chance that the carrier will increase the rates. My recommendation is take advantage of the 3 months prior to age 65 and line up your coverage ASAP. Remember you will need your Medicare card and effective dates for Part A and B to purchase insurance.