Passed at the 3rd attempt...
First attempt was at 17 and a couple of weeks. In the family's second car, a 9 year old Ford 100E Anglebox. Clouted the kerb during a left turn, plus I only looked in the mirror instead of over my shoulder when moving off. My fault - having had no lessons except from my father, although I'd been driving on a disused aerodrome for several years.
Second attempt was after a couple of lessons in a Morris 1000 estate car. This time it was 'insufficient progress' which got me - being perhaps too cautious after being overconfident the first time.
Then I passed my Private Pilots Licence, so could fly between aerodromes carrying passengers if someone could first drive me to the aerodrome!
Third time was after lessons with an experienced, placid chap in an Austin 1100. I breezed it, thankfully.