Retiring My Running Shoes

After running 349.72 km in my old Saucony running shoes, I now have to retire the pair. The uppers still look fine but the outer soles are all worn out. Experts say that running shoes must be replaced after around 300-500 miles (483-805 km), but some say that it really depends on several factors: the runner's weight and running style, the kind of shoes he or she wears, and his or her running style. Maybe a neutral runner like me who weighs 50 kg, wear a lightweight pair, and run primarily on the road need to replace their running shoes earlier than suggested.