A reasonable estimate of the lifetime of trees is 100-150 years. Based on information from the USDA Forest Service , the lifetime of trees varies by region and species, but generally ranges from 50 years to 300 years of age. An average lifetime of trees planted in forests for long-term restoration purposes might be 100-150 years. Here are a few examples by region
- In the Southeast, conifers may live 100-150 years, while hardwoods may live 150-200 years.
- In the northeast and lake states, some conifers (e.g. white pine and red pine) may live 100-150 years, while Jack pine lives 80-100 years; mixed hardwoods (e.g. maples and oaks) might live beyond 150 years, while aspen and birch might only live 50-70 years.
- In the Pacific Northwest, conifers may live 200-300 years and longer.
 McAliney, Mike. Arguments for Land Conservation: Documentation and Information Sources for Land Resources Protection, Trust for Public Land, Sacramento, CA, December, 1993
 Discussions with Monty Maldonado, U.S. Forest Service, Forests Management, tree planting program, October 5, 2011