For those track their health data, who need a universal metric to understand the effects of their health behavior, this sports and fitness activity tracking device, is a 1) new metric for measuring health, 2) a new sensor form factor, and 3) a new data display appliance. Unlike the Fitbit, Memento Mori tracks biological age, is an inconspicuous non-fashion non-jewelry sensor, and visualizes biological age with living organisms.