I have a lot on my back (wtf? seriously?) from when I gained a lot of weight in high school. There were always red, deep and quite easy to see.
I noticed recently that they've faded a lot. They're still there, but they're not red anymore (they're white). I've got an olive complexion so you can see them regardless but they've faded a lot. I'm assuming if I were paler skinned they would be even more difficult to see, but I'm not complaining
I had stretch marks on my arms too. Those have faded a LOT. You pretty much need to shove your face in my arms to see them at this point.