Why Boxer dog's die young

My first Boxer Jake lived 14 years. He was a big boy not fat, big at 80 lbs.He was twice the size of the rest of the litter.He was all white and had eye problems.My second Boxer Butch is 11 years old.I adopted Butch when he was 5years old,and he has never had any health issues.But the old man does have alittle arthritis now.Who said they don't live long????LOL

These pics are of Butch his black mask is turning white.