Preschool 3 to 4 years The second of our three preschool programs serves children from 3 years to 4 years. The teacher to child ratio is 1 to 9. 3-year olds are full of wonder and enjoy spending time observing and imitating. They are very curious at this age and fill their days by exploring the world around them. We enrich their days in the classroom by providing them with lots of hands-on activities, Because 3-year olds love to pretend, we provide plenty of opportunities for dress-up and imaginative activities.