When I was a 14 year old learning to play the guitar, there was no internet. Which meant that, if you wanted to learn a song, there were only a few ways to do it.
You could try and learn it ‘by ear’; you could have a friend show you how (assuming you had a friend who played guitar and knew the song in question); you could buy a guitar magazine and check out the included sheet music (assuming they transcribed that specific song in that specific issue)…