Im 61, 170lbs, size Medium fit perfectly out of the packaging. Will update review once these are washed, if they shrink even a little bit, theyll be too small.

After washing its too small. its a tight fit around the arms and the shirt rides up when i bend down. Shame because it was perfect before washing.

I also ordered a large which just arrived and makes me feel like a teenager from the 90s. Hopefully after washing it can shrink down to a normal fit.