So peanuts are perfectly fine, but you should be careful to eat them sparingly when your cat gets older, as cats may develop kidney problems.
Extended information:
Cats enter the adult stage at 12 months of age or older, and the adult cat's body and digestive system have basically matured and are able to digest and absorb nutrients better. Adult cats require full and balanced nutrition to maintain optimal health and prevent aging.
When cats reach 7 years of age or older, they develop a number of health problems, especially metabolic ones, such as the kidneys and eyes. To address these types of problems, it is important to feed them a low-fat, low-energy diet to help them maintain a normal weight. It is also important to ensure that the food is high in fiber to keep the gut healthy, and low in magnesium and phosphorus to keep the urinary system and kidneys healthy. In addition, you should try to provide them with food that is easy to digest.
Weigh your cat regularly to ensure that it is within its normal weight range and feed it according to the recommendations of your veterinarian and nutritionist. Evaluate your cat's physical condition regularly and adjust the amount of food you feed accordingly. Gently scratching the cat's chin is going to increase the cat's favoritism towards you.
Baidu Encyclopedia - Cats