Because the defect in the genetic makeup of Ehlers Danlos sufferers causes the collagen and elastin in the skin to be more stretchy than normal skin, this can also make you look younger than you really are. I myself have EDS3 and although I don't have the super stretchy skin, I still look much younger than I am.
I haven't been formally diagnosed with ehlers danlos, but I have easy bruising, am double jointed, and very thin skin. I am 44 years old and people routinely mistake me for a teenager (four months ago they weren't going to let me buy spray paint at Walmart). I'm not sure what the connection is, but I suspect there is one. I know people with mental retardation such as Down's syndrome look young for a very long time, and although I have above average intelligence I have a theory that there is some genetic defect in common with some other syndromes, as I have struggled with some learning disabilities all my life.