How old can a deep conditioning mask get until you have to throw it away?

I was going through my hallway combinet where we keep all the hair care products & I noticed that my mom had a deep conditioning mask by Pantene (pro-v) in there & I wanted to use it & I wasn't sure if I could because maybe it was too old. So I was wondering how old can it get & I can still use it & if it will affect my hair in anyway. (I did check the little date on a website & it claims the mask is from 2008.)

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