Urgh, my DH did this a few times. I am 50-ish now with young adult children, and when I was about 40-42, he did used to throw comments about like 'your mum was a looker when she was younger' (to the kids.) I said 'so I'm a dog now am I?' I would be like >>>
He would just laugh.
Then he would show me photos on his computer of me in my early 20s, and say 'look how sharp your jawline was then!' And 'look how white your teeth were.' And 'look how skinny you were, and how young you look!' 
I said, 'so basically you're saying I am now old and fat, with a double chin, and shitty fucking teeth?!' 
He said 'no of course not, I'm just saying!'
I said 'well kindly do NOT.'
Then one time when I was about 43, he got a new photo of me (I was size 16 at the time with a 36" waist,) and he photoshopped me to make my waist 6" thinner, and slimmed down my arms and thighs!!! He said 'look what I've done! You can send this photo to your penpals now!' 
I was fucking raging. I said 'why the fuck would I do THAT? I don't look like that. And WHY are you photoshopping me to slim me down?'
Shall I photoshop you to make your hair darker (it was 50% grey then,) and give you big muscles, and a massive cock, and make you 8 inches taller? How fucking dare you? STOP this shit. Changing how I look and comparing me to how I looked 18-20 years ago, before I had kids. What the hell is wrong with you?!'
Suffice to say, he never did it again.