My FWB started a new dating account app just for casual sex/one night stands/casual sexting and set the age range as 18-35. They’re 26 years old.

Is it creepy/predatory to potentially have a one night stand/casual sex(ting) with someone as young as 18 at that age? I figured not since they’re not looking for anything long-term or romantic, but I’m on the spectrum so I’m really not good at assessing this kind of stuff in relationships.