Flip a coin! Just kidding. Its a crap shoot. Your at the mileage and age where you probably should. I've been around vehicles wrenching on them for close to 50 years now, and I've never figured why, but disrupting a sealed system like the cooling, shouldn't affect other parts like a thermostat or water pump, but it does. I've had a perfectly functional thermostat stop opening, just by changing out the coolant. Whether your changing the radiator, or a shop, it's cheaper and safer with the radiator and fan out already. Again, it's a judgement call, but at 13 years old, I'd change the upper, and lower hoses as well as the pump.
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