I'll be 59 in a couple of weeks. Don't get down on yourself. The issue as I see it is that if it snowed gold it would be the new mess to be swept away. In other words the ability to do certain things well is not universal. The thing to do is find out what your best at and play within you limits. Age hasn't slowed me down. I've just never been able to play particularly fast. I've tried bluegrass, rock, blues. Having brain and hand dexterity is a talent. Lots of people hide behind distortion to make themselves sound powerful. But most of us fail. That's why good players are so highly valued. If one accepts that, it makes for still enjoyable playing as sometimes you will have a day or an event that thrills you because you did it, But try it ten more times and you'll probably blow eight of them. No big whoop. It's a good pass time. If you were meant to be a great guitarist, you would have eaten and slept with your guitar as a kid. Now watch me get slammed by the immature. Good luck and enjoy it for what it is.