I have a pin oak that's maybe 25 ft tall. My buddy told me it's a pin oak and I agree. He's a pretty knowledgeable guy . He was guessing it at about 75 years old? I have read That the pin oak is a fast grower? This looks like a slow grower to me ? It's a pretty tree And seems happy and heathy to me. Acorns are on the ground. I will let it live its life but is this a slow grower or what? The trunk is maybe 5 inches around.