I can start to answer that, and maybe Adrina can help out.
We have various programs. Some of them are seedling programs. Larger trees tend to follow a bit of an S-curve. Between 10 and 20 years of age, the tree will absorb the most carbon. There is no tracking at this point from an urban setting with regard to how much an urban tree absorbs over its lifetime. It obviously depends on the tree, the species, where it's planted and how long it lives.
I don't know if Adrina wants to add to that.