Anything here (depths of HE77 in the desert SW) over two years and you’re on borrowed time for the most part. I finally retired the 11 year old Optima blue top. It was in the boat during the summer and racecar trailer during the winter for cool down on the car and winch duty. It fails the load test but still starts the boat fine. Optima red top on my daily driver Jeep xj is a 2013. No idea why it’s still alive…. It’s hotter n hellfire under that hood in the summer!