- You know you are old when you say "Roll a d6" and your players of 30 years start start examining the dice and asking "Which is the d6?" - which is what always happened but now you realise that for the first time you no more have the energies to point at it.
- You know that you are old when you say "All the characters take 1d3 damage" - and when the smartest of them says "but... there is no d3..." you realise that you have no more energies, full stop.