I used to get that when my twins were born, or when I was carrying them. I was 20 and looked 12-15! I hate people reacting to me saying babies have babies! I snapped back at an older man once after he said that. "I'll have you know I'm 20 and have been married for a year and a half before my twins were born!" I felt better, but really it isn't any ones business.
I was wit my Dad one Day and a young man said to my Dad, Nice to have such a young and beautiful woman on your arm, I smiled and said to the young man, Thanks and he's my Dad too!
The guy looked so puzzled as we walked away!
Take it in stride, I still look young for my age, but I'm not as thin as I once was, so I don't get as many comments as I used to.
I rather look younger than older, my DH was accused of being ours youngest son's Grandpa!!!
I had a field day with that one!