You guess't that right ' after 60 years helping and the new people coming in. You find out that it is time to get out. Even the one you taught to fly tell you where to go. Built 9 planes last winter and guess what I got. I furnished the plane's and all the goodies for newbies, rebuilt the crashes and took on the next one ! for what!!!
When you love what you are doing ! does it make any difference. But there is a limit to what you can take.
NOW figure that one out
I am not an instructor but I love to help young people fly RC.