No. Although the Affordable Care Act allows your children to remain on your health insurance plan until age 26, you are not allowed to use funds from your HSA to pay for children over the age of 19, or 24 if they are full-time students, because IRS rules apply with HSAs. Because your son has graduated from college and is over the age of 19, you cannot use your HSA to pay for his expenses. (26 U.S.C § 152).
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