Maybe if you knew them at ten, and you were twenty, then yeah, that becomes dubious. Which is to say, if you knew them as a child—when you were an adult, then it becomes dubious. If you knew them as a kid when you were mid-teens, or if you knew them as a mid-to-late teen when you were in your twenties? Nope, don't care.

It's not my business what two legal adults wanna do together.