Senescent cells can be thought of as zombie cells. They accumulate as we age and while senescence is sometimes needed, like to stop the multiplication of damaged cells, the accumulation of senescent cells can often contribute “to the aging process and age-related diseases.” In mice studies, “clearing senescent cells delays the onset of age-related dysfunction and disease as well as all-cause mortality” and now researchers want to understand if the same could be true for humans. The National Institutes of Health (NIH) has launched an initiative to answer the questions that still loom about our senescent cells and how we can clear them out. Answering these questions may get us closer to delaying age-related diseases and all-cause mortality in humans.