My residential well pump is 28 years old, original to the construction of the house. It's a goulds 1/2hp submersible, 10GPM pump. Is there any good reason not to replace the pump within the next year? It's operating just fine right now, but my reasoning is that it's had a good life and I can schedule the replacement on my own time, instead of scrambling. These pumps dont typically last much longer than this right?