About 89,000 young people (ages 15 to 39) are diagnosed with cancer each year in the United States—accounting for about five percent of cancer diagnoses in the United States. This is about eight times the number of cancers diagnosed in children ages 0 to 14 and about one twentieth, or five percent, of the number of cancers diagnosed in adults 40 years and older, based on Cancer Facts and Figures  2020 by the American Cancer Society.