I'm the exact opposite. Back in my 20s I was surrounded by countless distractions: bar-hopping, parties, girls, video games, you name it. Sitting down and applying myself to learning something took tremendous effort.
Now that I'm in my 30s though, I have way more focus. I can easily sit down and work on a project for hours at a time. On top of that, I have way more motivation, because I have a very good idea of what I want in life and I know how to get there.