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if that were the case, you’d expect more cancer in older people as well, not just young people.
edit:
Cancer deaths are consistently declining in the US. American Cancer Society’s 2023 report
Despite the pandemic, and in contrast with other leading causes of death, the cancer death rate continued to decline from 2019 to 2020 (by 1.5%), contributing to a 33% overall reduction since 1991 and an estimated 3.8 million deaths averted.
more likely the opposite, we see higher “incidents” because of improved detection and reporting. meanwhile deaths decline because of improved treatments and prevention.