As I was driving my children to the haircut place Wednesday morning on our city’s equivalent of the German Autobahn, I was pondering reaction times, thinking about how they diminish as we age (actually, I was smugly thinking about how quickly I was able to go from the brake to the gas as the light changed to green to get on the on-ramp to the freeway and we left the others in our wake).  When we’re young, our reaction times are quick and immediate.  As we age, they slowly diminish, but when do we start to notice that they’ve become slower?  When do we *admit* that they’ve become slower?