Yes, my over is off too. The stove/oven is about 15 years old. Yesterday, I made a prime rib roast just for DH and me. The timing was off, however, it was still delicious. Today is a pork crown roast. It is done 30 minutes early because I cranked the oven to 375 degrees.
Get a decent cooking thermometer to check the temperature of poultry, roasts, etc. Pork and turkeys are now done at different temperatures than years ago. We no longer have to cook it to d*eath! LOL!
PS: My husband just had a conversation this morning about an induction cook-top and a convection oven for the kitchen update in the future.