yes you add them. WARNING you and your spouse can't contribute to an HSA for any month you are covered by Medicare.
per INFO 2016-0003 (modified)
Under section 223, the amount of the maximum HSA contribution deduction in the year
an individual reaches age 65 is prorated based on the number of months that the
individual is an eligible individual. In particular, the maximum contribution is based on
the number of months that the person is not enrolled in Medicare.
Assuming the taxpayers have coverage by a high deductible health plan (HDHP)
and no disqualifying coverage during 2016, for the 4 months that they have family
HDHP coverage before the wife enrolls in Medicare (starting in May). they would be allowed an HSA
contribution of $2,250 ($6,750 x 4/12) that could be divided between the couple’s HSAs
however they agree. In addition, the wife turning 65 in April would be allowed a
catch-up contribution of $333 ($1,000 x 4/12) into her HSA. The husband turns 65 in
October, assuming he continues with self-only HDHP coverage, would be allowed an
additional HSA contribution of $1,406 ($3,375 x 5/12). Also, that husband would be
allowed a catch-up contribution of $750 ($1,000 x 9/12) into his HSA.
