I am two years into my eighties, so naturally, my thoughts and conversations often turn to aging and the next thing that happens after aging. For no good reason, this has led me to think about my electric toothbrush. I don’t leave the toothbrush in its charging cradle (a lovely term), but use it until it begins to blink red to tell me it needs to be recharged. My sense is that over time the charge has begun to last shorter and shorter times.