HSA pay for Medicare Premiums for spouse?

I will turn 65 in 2022 and currently have an HSA.  My spouse is already on Medicare. 

 

1.  Can I use my HSA funds (prior to turning 65  and/or after turning 65) to pay HIS Medicare premiums Parts A, B, and D ?

 

2. If yes, will the funds be taxed as regular income since he is not the account holder? 

 

3.  If yes, can I use those funds to reimburse myself for the allowed parts of Medicare that has been taken out of his SS for the past few years; i.e., is there a time limit for reimbursement? 

 

Thank you!