A lot depends on the number of people employed by your husband’s company. As you probably know, Medicare Part A is free — but Part B is costly. So you may be able to delay signup for Part B. See below from Kiplingers.
Because you have health insurance through a large employer, you don’t have to sign up yet for Medicare Part A or Part B. Most people sign up for Part A at 65 because it is free (although some people delay signing up while working for a large employer so they can contribute to a health savings account). But many people who have coverage through a large employer delay signing up for Part B, which carries a premium and covers outpatient care, such as doctors’ visits and tests. The same goes if you’re covered under a spouse’s workplace plan. (However, if the employer has fewer than 20 employees, Medicare will be your primary coverage at 65, so in that case you usually need to sign up for Part A and Part B even if you have coverage at work.)