20 to 30 years. Pear trees have a long life. Pear trees can bear fruit for 20 to 30 years and bear fruit early. Generally, production starts in 5 years, and it can enter the full fruit period in 6 to 7 years. They are adaptable and easy to cultivate. They can be planted on mountains, fields and beaches. After 20 years, pear trees bear less and less fruit. Pear is a perennial deciduous tree of Rosaceae, which is widely distributed all over the world.