Aspen is a relatively short-lived tree. The age at which stands should be regenerated depends on site quality, desired products, and disease incidence. Stands managed for pulpwood generally should be harvested at age 45 to Stands grown primarily for sawtimber generally should be harvested at age 55 to Stands may need to be harvested by age 40 if disease incidence is high, even though site quality and desired products indicate harvesting at an older age.