Mom's prom dress from 1991 worn by her teen daughter on 2016

I agree. Mom had good taste.

Math really isn't your strong suit, is it?

Let me do the math for you, there is a 25 year gap between 1991 and 2016. The daughter is probably 18. So no.

this photo was taken for 2016 prom so chances are she was born in 97 or 98 (maybe 99 if she's not a senior, but going with a senior), a good 6 to 7 years after her mom probably graduated high school.