Shower has little hot water coming from it. If shower is on and I turn on the sink hot water, there is no hot water coming from it, also, in the kitchen, absolutely no, zero hot water. This unit, is about 65 years old. I think the pipes are clogged and rusted and probably need new ones. What do you think

this unit, is about 65 years old. I think the pipes are clogged and rusted and probably need new ones. What do you think
I think you have the same problem that I have at my place.My house's 55 years old with galvanined pipes that are so rusted up,(see images) that they can no longer supply the needed volume. If there was a magical cure I'd be doing it myself. Sadly there isn't. The only "cure"is a repipe job.
Good luck, Tom