Does portland cement get "stale"?

Does bagged ordinary portland cement get stale after a while? --in
other words does it lose it's ability to perform up to it's
specification? If so, how can I tell if its not worth using?

I have about 5 sacks that have sat in my garage for several years.
While the powder hasn't
hardened its somewhat cakey or crusty.

--Zeb

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