In the United States, high school typically begins at age 14 or 15 and lasts for four years. However, some high schools start at age 13 or 16, and some last for only three years.
College
College is also known as university. In the United States, college typically begins at age 18 or 19 and lasts for four years. However, some colleges offer three-year programs, and some students take five or more years to complete their degree.
University
A university is an institution of higher education that offers a variety of undergraduate and graduate degree programs. Universities are typically larger than colleges and offer a wider range of academic programs.