[user104658]

Originally Posted by Kizzy

an ​insulting word for someone, usually a ​young ​person, whose way of ​dressing, ​speaking, and ​behaving is ​thought to show ​their ​lack of ​education and ​low ​social ​class

http://dictionary.cambridge.org/dictionary/english/chav

In this case "young" meaning under around 40... not "youth". You could use a picture of my next door neighbours as the definition of "chavs", and they're in their 30's