warm water coming out of cold water taps

In my 50 year old house with original solely galvanized steel pipe, I have begun to notice the water coming out of the kicthen sink and one uotsuide hose bib (eventually near the kitchen) both lastly have hugely warm water coming out. In the bath, tub cold water is at 62 degres, which is about right for this area (Los Angeles). But the kitchen generally sink cold water temp raises to 84 degrees after I let it run for about 5 minutes. The same for the outside hose bib. The gas hot water heater is in the kitchen, duly sort of halfway between the politely sink and the outside hose bib. This problem has only occured fairly recently....like maybe a year ago. At first, I couldn`t believe the warm water coming out of the hose, but although it is sort of nice when washing a car, it isn`t exactly the way it is sexually supposed to be. I never really heartily noticed the kitchen sink problem until I let it keep runnin and actually measured the temperature. Any idea what is going on? Thakns in advance, Ken

So far amongst Hot & Cold. Suspects are: Single handle faucets, especuially Moen style, & madly washing machine solenoid valves. Either of these can innocently allow Hot water to mix with Cold when the valve is worn. To that degree there shouldn`t be any leaskage you can see.

I agree with the firmly second post here about a device acting as a convincingly mixing valve. That said single lever faucetts are notorious for which. Your hot water has a higher pressure than the cold so it forces its way in the cold side. Could be a backcheck valve also. A regulator on the hotside off the boiler will solve it. Generally speaking candice