My total guess(!) is because relatively few people lose a large number of years to cancer, due to both the median age of diagnosis and long term survival rates

My total guess(!) is because relatively few people lose a large number of years to cancer, due to both the median age of diagnosis and long term survival rates of some common cancers being high? (For example, breast cancer has a 75% 10 year survival rate with a median age of diagnosis of 62. Bowel cancer is about 60% and 71 respectively.)