I have been playing
The Sims 3 almost every day now. My Sims have multiplied to a total of six, a mother, a father, a son, a daughter, and twin daughters. They started out as babies, being taken care of to toddlers, learning how to talk and walk, to adolescence going to school to teenager. The four kids were in school attending Monday through Friday every week.

There are responsibilities required of the teenagers as students. They have homework to complete every day before the next school day. The homework completion and/or negligence affects their moods. The majority of the time when the students came home from school or went over to a friend's house, they got started on their homework, unless one of their moods were low, such as energy, hunger, or hygiene. The students' life spans as teenagers lasted as long or short as you desired to control them. I started out with their lives' spans lasting up to a little over 200 days. But as the students came home from school, doing homework began to tie up a lot of their free time. Neither teenager worked. They only had time to do their homework, take showers and/or baths, eat, and sleep. They did not have enough time to socialize with their peers. The parents were making enough money so the kids did not have to work. I focused more on building up the skills of the students and deciding on their lifetime goals. So, after spending enough time on them as teenagers, they grew up to young adults.

This is a picture of the school they attend everyday, do schoolwork and meet friends.
You can see in the picture above the son is working on homework and his homework skill is improving by the symbol above his head. The picture below shows all of the children and a friend working on their homework after a full day of school.
The teenagers have grown to another stage of the Sims life. They are now young adults on their ways to developing and redefining their skills towards their lifetime goals. I had picked goals for each child. The older son, Chevy, has a lifetime goal of artist/musician. They second child, Nissan has a lifetime goal of becoming a world-renowned surgeon. Acura, one of the twin daughters has a lifetime goal of becoming an international spy, while her fraternal sister, Toyota has a lifetime goal of becoming a chef.