Life expectancy?

My sweet boy just turned 9. In your experience, what’s a realistic life expectancy? In comparison, my giant Pyrenees turned 14 two weeks ago. She’s always been healthy, but we are making the hard decision to let her go this weekend. She has cancer that appeared quite suddenly. And now we are all panicking that we might not have many years left with our coonie. He’s healthy, sturdy and has a stomach of Teflon and a brain of pudding.