There is no specific age, it depends entirely on the individual. We get clients as young at 10 who get the middle of their eyebrows threaded without a very sharp overall shape. We try to accommodate our client’s requests, and only thread the unibrow and a few hairs to look more groomed but without thinning out the overall shape.
For clients under 16, we require that the parent or guardian is present for the treatment to go ahead.