@MikeC412889
As others have said, you need to understand how Medicare works with other insurance just so you don't get caught not signing up when you should. Those Medicare Part B & Part D premium penalties don't ever go away and get bigger as time goes by - So check with the HR Dept. at your wife's company to find out if
1. If it is credible coverage with Medicare - especially any prescription drug benefits (Part D)
2. Many employer coverages will make you sign up for (at least) Medicare Part A - that's the Hospital Insurance Medicare coverage and it is free to most beneficiaries if you have worked long enough to be vested and have paid your Medicare payroll taxes through the years.
Employer coverage can work with this part of Medicare, specifically and in some hierarchy of payment with the other parts sometimes - just be clear about both coverages and how they work together.
3. When you turn 65 - the size of the employer determines how their plan will work with Medicare. The HR Dept should be able to describe this to you.
Here is an explanation from Medicare.gov as to how this works - read it and then click on whichever scenario(s) apply to your case.
Medicare.gov - How Medicare works with other insurance
Just understand it and you should be fine.
It's Always Something . . . . Roseanna Roseannadanna