Colorectal cancer is no longer a disease of older people. People in their 50s, 40s and younger are increasingly being diagnosed with cancers of the colon and rectum. Incidence rates increased by about 2% per year in people younger than 50 during the past decade, according to the American Cancer Society. In 2019, 20% of colorectal cancers were in people aged 54 years or younger, up from 11% in 1995.