Do car seats expire

Boymama • Just had our third and last baby! #boymomforlife 💙💙💙
So I am currently pregnant with #3 and I'm wondering if I need a new infant car seat. The one I have from my other kids expired Dec 15. I've heard mixed reviews on whether or not they really "expire". What's your experience? I'd hate for something horrible to happen all because I didn't spend $100! The bases don't have an expiration on them (that I can find)....also confused about that. Advice/experience/recommendations??

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