Hoses in good condition feel hard when you try to squeeze them, hot or cold. Worn hoses feel somewhat squishy when you try that.
Having a rad hose blow on an expressway is no picnic. It happenmed to me once and the coolant will blow all over the windshield if it is an upper hose. Most hoses now are good for close to 100,000 miles. In any case 10 years is about the safe maximum for rubber parts.
Belts can snap without warning when they get old. Even if they look good. I drove a relative’s car across the country in late Novemer. When I started the car on a cold morning in the Mid West, the fan belt just snapped. These belts were the original and were 12 years old! Again, I would replace any belt 10 years or older.