You can always ask to be excused from jury duty at your age.
However, I was once on a jury and found the experience rewarding, even kind of thrilling in a way. It was a short trial, the whole thing was over in one day, so it wasn't exactly a big imposition on my life. I kept thinking, "Geez, this is real! We are not on a movie set, this is how the system really works!" We found the jerk guilty in less than 20 minutes.
However, I was once on a jury and found the experience rewarding, even kind of thrilling in a way. It was a short trial, the whole thing was over in one day, so it wasn't exactly a big imposition on my life. I kept thinking, "Geez, this is real! We are not on a movie set, this is how the system really works!" We found the jerk guilty in less than 20 minutes.