Genomic instability as a hallmark of aging refers to the increased tendency for errors, mutations, and damage to occur in an individual’s DNA as they grow older. Our DNA contains the instructions for our body’s functions, and when it becomes unstable, it can lead to various problems. Imagine it like the pages of a book becoming wrinkled and torn over time, making it harder to read and causing mistakes in the story. In the same way, genomic instability can result in errors in our body’s functions, contributing to the aging process and an increased risk of diseases like cancer.