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Three days riding an electric unicycle
Hi! Nice progres! The pain you feel is normal, you're using your legs in a way your body isn't used to. It should resolve itself after some time. I suggest you practice braking at some point, imo the most important skill. The more you get comfortable at higher speeds, the more you need to be able to lean way back to brake. Also, which model EUC do you have? You should try to experiment with the pedal hardness setting. This can greatly modify the feel and each person likes different feels. I personally prefered stiffer pedals while learning, but now I'm full on noodle mode (very soft) unless I'm goint in trails.
I'm 40 years old, so I can understand you, but I'd say that the community average is a bit older than me. You'll eventually get legs of steel.
My only downside about EUC is the gear. Having to put on and off all the gear when I get out is sometimes annoying, but necessary. Besides that, it's the most versatile, powerful, with the most range for the small package that it is. And by far the most fun mean of transportation there is imo. At some point it becomes intuitive and an extension of your body, it's a great feeling.