Do runescape pre-paid card expire?

So my brother bought me two $25 dollar 90 day membership runescape cards. So right now its 2020, he got it for my birthday in beginning of March of 2019. I am wondering do these cards ever expire? I read on the back of it and it says nothing about expiration date. So I am guessing that once I redeem it then it will not work and I have 90 days membership? Any runescape players that know? I do not play often but I am thinking about getting back into it. 

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