Everyone over 17 except my DD and one cousin around 50.
But I only passed around 8 months ago. Not through want of trying either. That was my last attempt, still don't know how the hell I managed it but I did, I used the same instructor and he said I was just completely different this time around.
Has it made my life easier? Yes, it has. I always knew it would, because I'm not stupid.
Was there some sort of magic that occurred that suddenly made me a different person when the examiner said I'd passed? No. I'm still the same person, it's not really affected anyone else's lives, just as not driving didn't affect them, both have only affected me predominantly.
I was independent before I passed and am independent now, it is actually possible to be independent without a driving licence, a bit more thought and planning is required (which is why I think it's funny when people call non drivers lazy) but it's not impossible as some people claim. And I'm not in London (or a city) either.