Help me coin a new word

I want to make up a word, for that moment when the time SINCE the end of some era equals the time DURING. Like when you're 4 years out of college, or when you're twice as old as your younger sibling, or when it's been 18 years (or 16 or 30 as the case may be) since you first had sex. Or how I started playing the guitar 12 years ago, when I was 12. You get the idea. What should we call it? Once we come up with the perfect word we're going viral with this thing, and it's going to be the first UNIVERSAL COGNATE, part of every lexicon in every language in the world.