Sometime one of these days, I will become 1,000,000,000 (one billion) seconds old. Of course, being born tends to be a messy affair, it’s not an exact science, and then there’s all those pesky leap seconds to contend with — so the exact moment will just come… and go… in a heartbeat; I won’t even notice. I remember being a bit apprehensive about the change of “prefix” when I turned 30 years old,...