How Can I Tell If A Branch Is Dead?
Snap a small twig and look inside: green and pliable means it's alive, brown and brittle means it isn't. Bark that's started peeling away from the wood underneath, and a section of the crown with no leaf buds while everything around it has them, are both strong tells too.
Do The Old Orchard Trees Drop Deadwood More Than The Others?
Somewhat - an aging fruit tree that hasn't been pruned in years often carries more deadwood than a maintained shade tree of the same age, since neglected fruiting wood dies back faster than it would under a regular pruning schedule. It's one more reason those older trees benefit from getting looked at.
Why Treat A Dead Branch As Urgent?
A living branch bends with the wind; a dead one has none of that flexibility left, so it fails suddenly rather than giving any warning first. Over a driveway, a play area, or a spot where people regularly walk, that's not something to leave for later.