 So the researchers determined accelerated aging by comparing people's biological age to their chronological age. And then they checked cancer registries to see how many in the group had been diagnosed with early cancers, which the researchers define as cancer appearing before the age of 55. There were nearly 3,200 cancer diagnosed. So the researchers found that people born in 1965 or later were 17% more likely to show accelerated aging than those born between 1950 and 1954.