My body is worn from years of work, what's left when my joints give out?

You can run any machine on the site blind, and the years that gave you that mastery have also worn your body toward its limit. The worry underneath, what is left when the joints give out, is a fair and serious one. Do not push it away. A body has an honest end to what it can take, and planning around that is wisdom, not defeat. Your value was never only in your joints. It is in the judgment you built, knowing the machines, reading the site, keeping people safe. That knowledge does not wear out the way a body does, and it is exactly what a site needs from someone who can no longer sit in the cab all day. Training, supervising, inspecting, dispatching, there are ways for your experience to keep earning. Start now, before it is forced. Take an honest look at your body and your money, and begin moving toward the next role while you still choose the timing. One conversation, one certification, one plan. The cab has limits. What you learned in it does not, and that is what you build the rest on.