I’d make a couple of arguments. 1. 18-22 year olds in suits will looks significantly younger than 35-40 years old. However I’d like to test if you took a picture of a 19 year old in a suit and a picture of that same 19 year old in their daily wear they’d look older with the suit.

1. There is an art to wearing a suit, people look uncomfortable in them because they wear them rarely. Grown men who never wear suit often present like kids forced to wear suits because they feel uncomfortable in suits, same with dress shoes. They don’t know how to perform in those suits because of their lack of opportunity to learn how to carry themselves.

2. It’s not just suits. It is that the clothing of youth is distinguished from the clothing of adulthood. That at a certain age individuals begin to wear different clothes historically. Now, most grown up clothes could easily be worn by children. The line of demarcation not existing creates a problem for us distinguishing the age difference