A good pair will offer protection from injury and reduce the occurence of muscle or joint aches resulting from poor footwear. Pay from around 45 upwards will get you a decent, basic shoe, and from 60 upwards you are getting more durability, quality and features beyond the basics. Seems a daft question, but the answer is fundamental in deciding which type of shoes are best for you . The mechanics of the running process are complex and every runner pronates - a word that simply describes the way your foot hits and leaves the ground. Your foot hits the ground on the outside of your heel and your foot rolls downwards and inwards as you move forward.
Pronation helps the foot absorb shock .
Can lead to lower leg and knee injuries in particular some runners underpronate - feet roll inwards only slightly and their feet don't absorb the shock as well. Can also lead to injury over time. Wet the bottom of your foot and then make a footprint on a flat, dry surface such as a white piece of paper on a hard floor. The most important feature to consider is the shape of the shoe as this is related to your foot type. You can see the shape of the shoe clearly by looking a the bottom of the shoes.