Growth factor: 5 years per inch of trunk diameter.
Wrap a tape measure around the trunk at about 4.5 ft (1.4 m) above the ground, the standard “DBH” (diameter at breast height) measurement point.
The math:
Diameter = Circumference ÷ π
Estimated Age ≈ Diameter × Growth Factor
Range shown = estimate ± 20% (real variance by soil, climate & care)
Trunk diameter (DBH)
19.1
in(48.5 cm)
Estimated age
75–110
years old
Midpoint: ~95 yrs
An estimate, not a precise measurement. Only ring counting gives an exact age.
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