The above is a great description of a Retail Sales Clerk, often referred to as a Sales Associate. However, I've been a Sales Associate for most of my life, over the past 30 years of so, and I would offer a different description; a second definition if you will. My experience of being a Sales Associate, sometimes with a wage, most times with a % commission, has been a pleasant one.
My kids were 6 and 7 when they got their 6 year molars but 6 is just an average age. Parents are familiar with when the 2 front teeth come in because that is what is so easily seen when a kid opens his mouth. Your kid may be as young as 10 when the 12 year molars come in. The wisdom teeth are suppose to come in as a young adult (between 18 and 25) but some people's wisdom teeth never come in because their mouth is too small for 32 teeth.
At 6 years, the 4 first permanent molars start to grow in at the back of the mouth. This means an 8-year-old child should have 24 teeth, or spaces for them. At 12 years, the 4 second permanent molars grow in behind the first molars. This means a 14-year-old child should have 28 teeth, or spaces for them. Between 16 and 22 years, the 4 third permanent molars grow in. This means that an adult usually has a total of 32 permanent teeth: 16 on top and 16 on the bottom.