Do bottles expire?

Ella

Dumb question but do baby bottles expire? I just had a baby two months ago and have a bunch of 5oz bottles. Three of them in particular were expensive. I was wondering if i were to have another baby in the next 5 years if i could use the same ones? And just buy new nipples if anything. They are all bpa free. From nuk, spectra and some dollar store ones that if anything i could at least not reuse the dollar store ones