Five Husbands - Age Logic

I mentioned to the girl who thinks I have five husbands that the new string teacher and I went to the same school, and that teacher was a year or 2 older than me. 

 

Girl: Okay... how old are you? 

Me: How old do you think I am? 

Girl: 15? 

Me: How would I have 5 husbands? I'm pretty sure that's illegal. 

Girl: oh...50? 

Me: (glare) 

Girl: 20? 

Me: That's a better number, let's stay there.