Any chainsaw / firewood cutting experts on here?

I've got three old Stihls. They have all cut more cords of wood than I can remember. They are all from the early seventies. One 020AV and two 031AVs. They all still start right up and cut wood like new saws. I have replaced bars, chains and a few sprockets along with a couple of spark plugs and that's all I've done to them. You made a good choice.