How often do you guys replace your shoes?

I'm in a bit more pain than usual and my recipe of shoes plus insoles really helped me for a long time. The only thought that I could think of is that maybe my shoes are getting old, I got them in November last year and have worn them every single day since then. I don't run marathons or anything but I'm thinking there could be a problem with having old insoles and shoes. What do you think?