On average, guinea pigs live between 5 and 7 years. However, some guinea pigs may live longer, while others may have a shorter lifespan. According to the RSPCA, typically guinea pigs live for 5-6 years, but some may live longer. Factors that can influence a guinea pigs lifespan include genetics, diet, environment, and overall care. Guinea pigs are usually considered seniors once they are more than 5 years old, and senior guinea pigs may experience age-related health issues and physical changes. To ensure that your guinea pig lives a long and healthy life, it is important to provide them with a balanced diet supplemented with vitamin C, a clean and spacious living environment, and regular veterinary check-ups.