Reishi Question

Hey all! Long time no post

Took a stroll in the woods today and came across what I believe to be Reishi! Found it on a few dead/dying hemlock which further supports my notion
However, the only downside is that the specimens I discovered look to be a bit too mature, and some have suffered from frost and insect damage. There were still a few up on standing trees, but I wasn't prepared to scale up and check them out
Anyways, I guess my question is, at what point is it too late to consider reishi harvestable?
The photos I'm attaching are just a few of what I found, but for the most part mirror what ever else was there
Obviously I'd love to come out of this with something for my basket, but if not, I'm still totally stoked to have found some at last!
Thoughts?
I'm holding out hope that the ones out of reach are a bit healthier
Also - my apologies if I've misidentified. My excitement may have gotten the best of me
Thanks all!
Brendan

bump:)