When you can tell Rick Stein is an odd fit for repeats on Dave, but you also find his shows some of the more watchable and intelligent on the channel...
Realizing you are older than the next prime minister.
^When the next prime minster after the next one will be even younger than you!!
The description "knocking on".
As in "there's that old geezer. He must be knocking on. Blimey, he looked like he were knocking on 20 years ago..."
When you look in the mirror and spot your first wrinkle
...when you remember the previous-but-one monarch...
…when the barber asks if you want your eyebrows trimming!
Fucks sake.