Galvanized lines rust shut from the inside, and copper can wear thin and start to pinhole. In homes around Old Poway, Twin Peaks and Green Valley where the pipe is wearing out, the leaks tend to turn up in different rooms, one after the other. With long runs to every bathroom, the pressure drop usually shows up at the far end of the house first.
A repipe isn't the answer to every leak. A single leak gets repaired. When leaks keep coming in different places, the system is wearing out as a whole, and every patch is money spent on pipe that's on its way out. The contractor looks at what's actually in your walls and tells you plainly whether it's time, or whether repairs still make sense.
When it is time, the work is planned around your household. New lines in PEX or copper run to every fixture, and wall openings are kept to what's needed. Larger homes can take a little longer, and you'll know the timeline before anything starts. The options, costs and tradeoffs come first, in plain English, and the call is yours.