I have been wanting to post about this preserve located out of Kennett Square, which has a rare 10-13 acre section of old-growth/very early secondary growth. Anyhow, It has plenty of very tall and large trees, especially unblighted beech (for now), and oak, in the old-growth section in a stream valley with many large boulders lying around.
The preserve, owned by the Land Conservancy for Southern Chester County (Tlc for Scc), is around 80 acres in size, and boasts of a large white oak at the parking lot that appears to be in good health.
I have registered many of the old-growth trees on monumental trees: https://www.monumentaltrees.com/en/usa/pennsylvania/chestercounty/25912_statelinewoodspreserve/
However, I will put my findings here as well.
Here is a photo of the 6' DBH White oak at the entrance of the preserve, with a human for comparison: I would place the age at around 250-300 years, as it appears it used to grow in a forest, and then at some point the forest was cleared, and this oak was allowed to grow in the open.
Now, traveling into the stream valley along a trail, we are greeted by old-growth, with Beech making a stunning appearance (note the very tall tulips in the background, and the large burl on an oak): I would estimate the height for most of the old tulips to be around 155'-165', and Oak at 130'-135', and beech at 135'-145' possibly
As we travel further along a steep hill-side with the old-growth, we pass a large Tulip tree, with a CBH of 3.4 meters, and a height of approx. 135'. What I found fascinating about this tree, is that it has evidence of the bark balding up to 7 feet high, which signaled to me that it was a very old tulip, and this part of the forest was indeed old-growth: And here is a view of the same tulip looking upward from the ground: Now, as I looped around the old-growth forest, a trail passes close to a old-growth American beech. This beech currently is the tallest tree I have "accurately" measured in this forest at 42 meters, or about 140 feet: Finally, here is a last image I made of the old-growth sections of the preserve: Well, that's it for now. I have described more tree on Monumentaltrees.com, though I am hoping I will be able to add more trees onto this discussion later on.
(Let it be known that I don't have a 3 point measurement device, so I use a clinometer. However, I use extra caution, and take measurements from different angles and distances from where I believe is the tallest point(s) in the canopy (and on flat ground as much as possible), to get a relatively accurate result. It can take well over and hour with this method just to measure one tree. However, it would be great if we could go and check out the heights with a 3-point device. I wish I was able to get my hands on one, but I cant afford them.)

BeeEnvironment