By Nina Friedman, SciStarter.com blog contributor

For decades, fair- and festival-goers around the country have volunteered to step right up and have a carnival busker guess their age. Now, guessing someone’s age through citizen science can contribute to research in the social and computer sciences and medicine, too.

Everyday scientists and medical professionals are creating lifespan increasing technologies. Researchers across the globe are bettering our health so quickly that the average