Here is a reference I found. See "Healthcare reform and adult children covered by your HDHP" (pdf page 16, document page 9) in: <a rel="nofollow" target="_blank" href="
http://healthequity.com/doclib/hsa/guidebook.pdf">http://healthequity.com/doclib/hsa/guidebook.pdf</...>
You be the judge of this reference's authoritativeness. There are other references out there saying the same thing.
