Im having problems with about a week ago my spare bathroom faucet stop having hot water now tonight my Kitchen faucet stop having hot water.. THe house is Five years old and the water heater is elec.. What should I check first?

"What should I check first?"
The water heater for mineral build up. For long life and fewer troubles you should keep your heater clear of mineral build-up by flushing on a regular schedule. Let me show you how. Attach a hose to the boiler drain at the bottom of the tank. With the pressure on, open the boiler drain and let it run until the water runs clear. You will see a spurt of red,(rust) followed by white grains,(lime or calcium carbonate). This shouldn't take more then a few minutes. Do this monthly to keep it clear. Now flush out your hot water lines on all the fixtures that are affected. Now pull each aerator and clean the screens. Be sure you put them back togather the same way you took them out. Don't forget to flush it out every month. Your heater will thank you for it. Good luck, Tom