USDA PLANTS Database:
http://plants.usda.gov/index.html Under 'More Information: Characteristics' tree lifespan is listed.
Lifespan: What is the expected lifespan (in years) of a perennial plant relative to other species with the same growth habit? For the Tree growth habit: Short: < 100; Moderate: 100 - 250; Long: >250.
This website
http://environ.binghamton.edu/urban/edible.html has good info for fruit and nut trees.
FWIW,
Tim
