I covet your trees!! 😂😁
What species are they? They have the look of Elm or Green Ash to me but it is tough to tell in a picture. The one tree looks like it has some dead wood that should be removed. How are you situated for Dutch Elm and the emerald ash borer?

If they suit your region, you may want to consider planting a few mountain ash/rowan trees that will eventually replace these. They do not seem to have any disease/predators --yet-- at least not in my neck of the woods.