The author, unPhotoshopped, 1st September 2019. And yes, I know, the towel is my best feature these days…

Old is a relative concept, like an aged aunt or a cantankerous geriatric grandfather.

Old is someone else’s age. When we’re in our teens, old is the nearly unimaginable decrepitude of forty.

(That, by the way, is why older people generally find teens so annoying.)

For geologists, old is half a billion years or more. For cosmologists, old is measured in many billions of years…