This week, I officially signed up for an unusual competition. One that rewards competitors for getting younger. I recently turned 40, and I don't need reminding that both time and my chronological age only tick forward. But this game is focused on competitors' biological ages-figures that are meant to provide a better way to measure...

This is today's edition of The Download, our weekday newsletter that provides a daily dose of what's going on in the world of technology. A new contest pits competitors against each other in a race to biological youth -Jessica Hamzelou This week, I officially signed up for an unusual competition. One that rewards competitors for...