Cheeseandwin, if a man came on and said he wasn't attracted to his wife because she looked like she was in her 70s when she was only in her 50s I would understand it.
I certainly wouldn't make out he's a horrible person. I think most people accept the average rate of aging, a bit of weight gain and changes to a woman's body after having kids etc. I do think it's shallow if people can't accept those changes.
But if it's something drastic like looking 70 at age 50 or doubling your body weight then I can see how people end up not being attracted to their partners.
Actually with the weight thing, I don't necessarily think it's the weight that causes the issues most of the time, it's the way the person complains about their weight all the time, doesn't do much about it, how it affects their body confidence, sex life and energy levels and so on.
I can see that the OPs situation is more rare than that but she doesn't deserve the nasty comments thrown her way over this.
Attraction is massively important in a passionate relationship, which is what some people want, not everyone wants just companionship. They want to lust after their partner, and some manage to do that in long term marriage. Yes, love can make someone seem more attracted to their partner despite aging, flaws and all of that stuff, but unfortunately in the OPs case she loves him but isn't attracted to him. It's not her fault.