Want to know how to tell if someone is of a certain age? The simple answer is they carry cash. Yes, the new marker of middle age is the sound of coins rattling in your purse. In my book, if you have notes or coins on you, that immediately puts you over the age of 40.

I’m 26 and none of my friends ever pay with cash. It is an alien concept for my generation. Like it or not, we are moving toward a cashless society. A measly one in six payments are now made in cash, according to a study by UK Finance last year.