I've just over 12,000 miles on my 2014 MP412C and while they have plenty of tread, the date codes are way beyond the safe zone. Obviously I drive like a wuss, but give me a break, I'm 70 years old. So should I just replace the PZero's or go with something else? I never track it and frankly, rarely go over the speed limit. Also, what should I expect to spend out-the-door for the new tires, install, road force balancing and new alignment? Thanks for your help in advance.