I started learning guitar when I was 30. That was seven years ago. I've had private lessons from the start, and approaching it that way was probably the best decision I made.
The teacher sees my strengths and weaknesses. He gives me tips and important impulses. In addition, the lessons put me under pressure to stay on the ball all the time. Even if I wasn't that motivated or didn't have time to practice. Through the lessons, this hobby always has its place.