It is found that relativistic matter wave provides a biological clock for human beings. Due to gravity, the human mean lifespan on the Earth is calculated to be 84 years. In 2017, Sarnoski et al reported a 384-well plate-based technique which enables rapid assessment of lifespan in a high throughput manner. They sought to test whether it was suitable to screening for compounds that extend yeast replicative lifespan. They selected several libraries containing 2640 compounds, including kinase inhibitors, FDA-approved compounds, and compounds that had failed clinical development. Unfortunately, although there are some different readings from lifespan extension tests, Sarnoski et al were unable to determine a compound that could extend lifespan by more than 20%. We simply concluded that their efforts to screen compounds that extend lifespan among 2640 compounds have failed. The failure of 2640 compounds indirectly support our assertion that the biological clock is determined by quantum gravity.