Oh how I have been through those same feelings... everyone had great things to say that I would say all over again if it would make a difference to how you feel, but I wanted to remind you that those stretch marks were made carrying HIS children to term. Should he not love you more because of that? Was he not proud to walk beside you when you carried those kids that he helped create? I would hope so and I would hope he would remember that when looking at you today.
You have experience in the world that she doesn't have yet and that is invaluable! There is nothing like a confident older women. They have a richness that youth just don't have because they have not experienced enough yet. Each age and stage has value and should be honoured. I'm sure your husband knows that and recognizes that. If not then you can remind him