Most convertible carseats have a 7 year expiration so you'd get a year out of it (depending on the full date). Target usually has a carseat trade it event in April, you could trade in your old one and get a new one for 20% off.
What car seat and what is the date on the seat x
There should be an expiration date printed on it somewhere ! I would check for that or as others have said, look it up on the manufacturers site
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I’d check the car seat manufacturer’s website for an expiration date.