Okayy so a little TMI but not really. But I had an unopened box of always pearl tampons I bought 1…

Okayy so a little TMI but not really. But I had an unopened box of always pearl tampons I bought 1 or 2 years ago n I just started my first cycle since I had my daughter. (I had two babies back to back, so this is only my 2nd period in 2 years). I was wondering when tampons expire. I've opened the box and used 2 or 3 so far n since there is no date on the box I thought they don't expire at all. But other ppl are saying they do expire. I also Googled it and one thing said they expire after 5 years and another thing said they don't expire at all. So I'm wondering if I can continue to use them or should I toss them and again when do tampons expire.