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exists and is an alternate of . North American Green/Red Ash can live for 300+ years and White Ash 600+ years. Black Ash & Blue Ash are shorter lived types with 100-150 year possible lifespans.
Report Abuse. 1  Dogwoods could live to be 60 or 70 years old, providing they stay healthy. I know of some that are probably 40-50 years old now. 2  A dogwood tree can live anywhere from 12 to 40 years in the landscape. I hope, if you planted it correctly, that it will live longer! If you are experiencing the kind of dieback you describe, it is not likely that the tree is salvageable.