I thought long and hard on this topic but I finally came up with a definitive answer.
I know all my fangirls are dying to find out if they meet the age requirement.
So after careful consideration the youngest actual birthdate of a girl I would date is....
Actually I had originally decided on 1994 so I could date Krystal. But then I remembered something even more important. So I changed it to...
1995. So I could date Seolhyun. There that's it. If you were born after 1995 you're out of luck sorry.