There was a middle-aged fellow at my home mountain for whom the CSIA Level 3 was a really tough slog. Kudos to him though: even though he kept failing the exam, he persevered, diligently training and retaking the exam year after year. One day I overheard a conversation between him and a new instructor:
Old guy: Hey, haven't met you before, are you new?
New guy: Yeah, but I have many years of experience at [other mountain]
Old guy: Well welcome to the team, awesome to meet you.
...[small talk, eventually turns to exam talk]...
New guy: So you gonna do the Level 3?
Old guy: Sure, I'll keep trying, though I already failed it seven times! It's not an easy one for an old guy like me.
New guy: Wow, seven times, eh? I'm not into that, I'm like a sniper: One shot, one kill.
Old guy: Uh ... okay, good luck!
A few weeks later, the old guy finally passed it on his 8th try. The not-so-new-anymore guy has since failed it a couple of times and just given up altogether.