When you flew in a Hastings.
When the mob wasn't run by beancounters and jobsworths.
When you realise that some of the first Lightning pilots are now in their 90's.
When Wg Cmdrs are as old as your son.
When you take your grandkids round one of those living history museums and tell them 'We used to have one of those when I was little, and one of those, and one of'...
When GA flying was £7 an hour
.