I am 51 and wear a size 5, but have narrow thin feet. Bought my size and they are perfect. I typically buy a 5.5 in altra running or brooks but my feet shove forward and my big toe pushes out of the shoe within months of running and working out at the gym. The laces are slightly flexible like elastic so you can pull to make the shoe even narrower. I love that the shape is a natural foot shape.