How old do you have to be to have a Class 6 or 7 pattern?

My dad went NW7 in his early-mid twenties. I’m 19 right now and just using minoxidil and nizoral. I’m adding dermarolling soon. I have diffuse thinning, not too bad at the moment (but since I’m light skinned with black hair it’s still a little visible :/) but I really hope minoxidil stabilizes it for at least a couple years

If you take after your dad, you will see the pattern before you are 26.  Sorry, but that is the probable truth