As in 401k and IRA contributions, you are allowed to contribute extra if you are above a certain age. If you are age 55 or older by the end of year, you can contribute additional $1,000 to your HSA. If you are married, and both of you are age 55, each of you can contribute additional $1,000.
However, because HSA is in an individual’s name — there is no joint HSA even when you have family coverage — only the person age 55 or older can contribute the additional $1,000 in his or her own name. If only the husband is 55 or older and the wife contributes the full family contribution limit to the HSA in her name, the husband has to open a separate account for the additional $1,000. If both husband and wife are age 55 or older, they must have two HSA accounts if they want to contribute the maximum.
There’s no way to hit the combined maximum with only one account.