When you don't really care how old you are!

When you realise the new teacher at school wasn't even born when you started teaching.

When your daughter tells you about her night out, and you don't recognise anything she drank!

When all the shops are selling styles you wore in your twenties - and you've just cleared out your wardrobe and recycled them all.

When the rockstars you loved are now featured on a "Vintage" TV channel!