Age limit for fetish work

Having been in the fetish industry for 10 years I’ve only ever worked with one 18-year-old model, and that was a very long time ago.
I have recently been contacted by a young lady who is only 18 years of age, and as my clips are sold all over the world including the USA, I am wondering whether the minimum age is now 21 years old for fetish work?

Never had to worry about it in recent times because all ladies I have worked with have been in their 20s or 30s.