It comes to us all, doesn't it, that someone rams our age down our throats, not meaning to be unkind, but it hits us under the belt.
For me, it was hearing a nurse in the gynae surgical ward telling a young mother, "I'll be back in a minute, I've promised to help an old lady downstairs to her taxi."
I had had surgery and wasn't allowed to lift anything and granted the nurse did not intend me to hear her remark, but still - at 69 I did not feel like "an old lady" - still don't two years later. And to cap it all, the nurse was at the most, six years younger than I! Granted the woman she was speaking to would doubtless have called me old too, it was after all her wean who had kept both the maternity ward and the gyneæ one awake around 4.a.m by his strident disapproval of the world he had just arrived in. Nice healthly lungs at any rate and the strength to use them!
Try to not let it worry you. Five years age difference between you and you husband is nothing uncommon. My husband is five years younger than I but due to ill health looks older than I do (on my good days.)