Validity of Old GC

I got my GC thru family in 1987. It is the old card with no expiry date on it.
Is my card still valid(it\'s been 13+ years) or do I have to apply for a new card. I have to go abroad for a month and am not sure if
the same card will work or if I\'ll have to do something else. Also if the card has to
be changed what is the procedure.
Any ideas.
Thanks.
 
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