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.
Babies do not chew with their teeth, they mash foods with their gums. Molars are the teeth that we use to chew our foods with. Most babies will not begin to cut molars until around 10-16 months or older. The last set of molars to come in typically occurs around age 2 years old. Most children have all 20 baby teeth by the age of two-and-a-half to three years.