well, thats one way to look at it.
i've had stretch marks on my inner thighs and a few on my hips since i was a young young teen.
almost exactly like this chicks (i know its not much)
they haven't seemed to progress much at all but it was something i hated hated hated being young. now i don't care because really? what am i gon do, hide em forever? dumb. uncomfortable. and the upside, being old... most people big and small, male or female, have them and don't seem to pay any mind.
anyways, the awesome things is you are working to be healthier and thats just great!