I played guitar as a teen. I put it down around 20 and didn't start again until 45 so a gap of 25 years. Some of it was still there, I remembered some chords, theory etc but my fingers were almost back to beginner level. I had work mates asking me to teach them and I kept saying that I haven't played in 25 years, I am still learning or relearning myself. I went away on a holiday for a week not long after re-starting and when I came back I found that I had gone backwards a little and that was just 1 week!
The way this show makes it look is you can just start again after such a long break and it's like you never stopped. It's not like that in real life. Someone mentioned the ball player who never made the majors but teaches instead. I think sports might be different, I don't know. But art like dancing and music aren't the same as sport. You really do need to keep practicing it to stay sharp.