What age grade (age set) do you find in the United States? Are there more than one?

The U.S. has many age sets -- from preschoolers through high school, young adults and on to the elderly.

http://en.wikipedia.org/wiki/Age_set

Thank you. I must say

It seems to me that we have many age sets. Starting at birth which moves into toddler and then child each one having their own grouping of tasks and learning objectives. We then find adolescent/teen and then adults (young and middle) which moves into seniors/elders. Which again have their own set of learning and skills needed.

Baby 0-12 months, learn basic feeding and physical skills.

Toddler 13m-3 years, learn some independence continue learning physical skills, start social skills

Child/Kid 4-12 years, start formal education, improve social skills

Teen 12-18 years, continue formal education, start learning workforce skills

Young adult 18-40 years, start higher education/job skills become working member of society, have children

Middle adults 41-60 continue in the workforce and raising children

Seniors 60 - death, enjoy the fruits of having worked for the last 40 years, and possibly grand children.

All based in a perfect world were you don't die before 60 and are not trying to start/finish higher education in your 30s and 40s. :)

In the United States, age grades or age sets are not as strictly defined or practiced as in some other cultures or societies. However, there are certain age categories that are commonly recognized and referred to.

One such age grade commonly referenced in the United States is the school-age grade system, which consists of various grade levels from kindergarten to twelfth grade. This system roughly corresponds to different age groups, starting around 5-6 years old for kindergarten and ending around 17-18 years old for twelfth grade. The specific age range for each grade may vary slightly depending on local regulations and individual circumstances.

Additionally, there are some other age-based classifications that exist in American society, although they may not be as structured or formalized as traditional age grades. For example, there are often distinctions made between children, teenagers, young adults, middle-aged adults, and seniors or older adults. However, these categories are more loose and subjective compared to age grades found in some other cultures.

Overall, while the United States does not have a strictly defined age grade system like some other societies, it has age-related classifications such as school grades and general age groupings that are commonly used for categorization and understanding of individuals based on their age.