Am I wrong for "letting myself go"?

My husband told me he's not attracted to me anymore because I'm showing my aging. I'm going gray. I have crows feet and am getting little wrinkles in other places. I'm 47 and my husband said I could dye my hair and there is so much anti aging stuff I can get. But... I don't want to dye my hair... And I don't want to stop my aging. It's a sign I'm still alive. These wrinkles I'm getting are memories. I love myself. I love my grays. I've dyed my hair funky colors in the past but I'm content with my hair color now and content that I'm going gray. I told my husband he can't expect me to look 20-30 forever and he said then I can't expect him to be attracted to me forever especially when there are creams to stop aging. My sister says I'm wrong and if I don't change my mans eyes will wonder elsewhere and he could cheat. I feel like getting older is just a part of life. Why can't he accept that?

@Lydia first off I do wear makeup. Second of all my husband is losing his hair and going gray and I never said anything about it. Getting older is apart of life. When I said "I Do!" I said that under the impression we were gonna grow old together. Me "letting myself go" is my body doing what it does. I don't want to dye my hair anymore. I just to when I was younger. We are all gonna get old one day. I know 47 isn't that old but my body is doing what it does. I still go out and have fun. Idk why you are making these assumptions about me when the things I said he had issues with are my wrinkles and my grays. Nowhere did I say I don't wear makeup or go out or take care of myself.