There is no single lifespan number that applies to every landscape tree. The site around the tree often matters as much as the species on the tag.
Stress accumulates
Compaction, drought, root loss, topping, poor drainage, pests, and repeated storm damage can compound over time even when the tree still looks full.
Maintenance should match the goal
Clearance pruning, structural pruning, hazard reduction, plant health care, and removal planning each serve a different purpose. Good care starts with the outcome you want.
Plan before the emergency
Periodic inspection is especially useful for mature trees near homes, drives, fences, utilities, and high-use areas. A documented plan can reduce rushed decisions after a storm.