What's a dead giveaway of how old you are without giving the actual number?

Any of these:

- knowing the value of "x" in this: 1/4, 1/2, 1, x, 3, 6, 12, 24, 30, 60, 120, 240, 1200, 2400;

- Imperial units of measure,

- the Dozens Rule,

- using Logarithms as arithmetical tools (not their continuing life in science),

- Compound Multiplication,

- Practical Householder magazine, ads for 'Fablon' and all (our Dad subscribed to it),

- Mrs Dale's Diary (our Mam listened to that wireless soap-opera, not me!)

- and remembering how to use a Pay-On-Answer, coin-operated telephone... among many other things.

- Like ale at 1s. 3d. a pint.