Why don’t transplants from the elderly turn into cancer bombs?

I.

According to the tumor suppression theory of aging, the root of age-related Dysfunction lies in the accumulation of somatic mutation with age. Young cells are aligned with each other on cooperation, but years of life produce cheater cells that are better at competition and more fit for the environment. They gradually overtake the less competitive clones and are more cancer prone to compensate the body turns down its regenerative ability which makes it harder to recover from illnesses. At the limit of a very advanced age, the cells are so precancerous