Car seats are generally good for about 6 to 10 years from their date of manufacture. The exact lifespan depends on the brand and model, with some expiring as early as 6 years and others lasting up to 10 years. The expiration is due to wear and tear of materials, evolving safety standards, and potential recalls. It's important to find the specific expiration date on the car seat's label or manual and never use a car seat past its expiration date to ensure safety.