Sean Freeman

Great picture Azreal, I was loathed to guess after my attempt on the regrowth pics Eric put up but would have said around 75yrs mark, they can be so variable up here, when a water and in good conditions reach that size (diff species!) in 40-50yrs but in unfavourable conditions yes 100yrs plus!
Some of the best guides you can get come from the Botanic gardens if you're lucky enough to have one in your locality...where you know when trees were planted, and can judge the growth rate.

I'd also say that that you'd prpobably find the really old trees heading towards the 500yrs range further south, every other aspect of the ecosystem is so pumped up here that as the trees age even without our "helpful" interventions they rapidly fall into the spiral of "recycling" through many thousands of little organisms living out their life cycles on and in the wood tissues.

__________________
Sean

Trees are poems that earth writes upon the sky,
We fell them down and turn them into paper,
That we may record our emptiness.
- Kahlil Gibran