Okay, you're really making me feel bad, Bronze. You, sir, are the King of Preventive Maintenance!Then change out your hoses every five years.
It's a seriously great idea, but I guess I'm way too lazy, and I guess a bit of a gambler. I have to admit I don't routinely replace them. But if I had plastic, I probably would.
Come to think of it, the only plastic I probably have is toilet supply lines (even though they're braided they still have a plastic type lining), and I do replace those when I do any ballcock repairs, so maybe I'm a little less lazy than I first thought.