Okay, I’ll bite, but I am sure this is quite what you were meaning when wrote the question.
Shortly after I had my newest baby, I went shopping with my daughter (14) and the baby. My daughter was holding him while I was looking at some clothes. Some older lady came up and was saying how cute he was and then asked my daughter if grandma was enjoying the baby (she was referring to me, in case you didn’t catch that) My daughter was floored. She was speechless for a minute then she recovered and told the lady that was her brother and I was the mom.
This kind of surprised me on several levels. One, my daughter barely looks fourteen. She doesn’t wear makeup and is petite; I say this to explain she is not a 14 year old who looks 16 or 18. So, it was kind of shocking that it is so common for young teenagers to have babies that when someone saw two females with a baby and the younger was holding him it was assumed the young teenager was the mother. Two, although I realize how old I am, it hit me that if I had started having kids when I was 18 and they had a kid when they were 18, I really am old enough to be a grandmother.