Im 54, size 8. I got a medium. Excellent fit.
As soon as I put them on, I felt like I had been recruited as part of a heist. Dress it up or down. Man, I didn't think these would be comfortable, but they are. I was terrified to open the package as most reviews people said the pants smelled. No smell. Thanks to everyone who posted photos! Exactly what I expected, and I got them wicked fast (bonus).