My son is 27 and he will walk in a 27 foot circle around a chain saw. When he was young he would help me on side jobs. He hated manual labor and I told him if he didn't want to wind up digging ditches, he better get smart. Even though he didn't like tree work, he has a very strong work ethic, and he would work his butt off helping me. He took my advice and got smart, he has a bachelors degree in physics, and bachelors and masters degrees in computer science. He works for Raytheon on anti missile radar systems. The last time I asked him to help me on a side job he said, No Dad, I don't like seeing you get beat up doing that work, so if you can't do it without me, I'm not helping. He is a very wise young man. I spent my whole life being the one that did more than any one else, and made a lot of money doing it. I have enough money I can do almost anything I like, but, I'm so beat up, I can't do the things I can afford.
To answer the question, he has never run a saw. I have to run one at least once a day.