Should I change belt on zero turn mower?

I've got a Toro 48" deck zero turn mower that I'm going to change blades on. The mower is at least nine years old and has 160 hours on it. The first few summers I had 1.5 acres to cut but the last seven years just a half acre. Since I'll be taking the deck off to replace the blades would it wise to replace the belt while I'm at it?

Thanks for any tips or advice.