Pro Membership Code Expiration

When you receive a pro membership code for being featured on the homepage or winning a contest, does the code ever expire? I have a couple from about a year ago that I wanted to pass on to others, but I'd hate to give them something that doesn't work. 

Is there an expiration period, or should the code work forever?

Thanks!

It should work forever! It doesn't start ticking away at the time until someone activates it. :)
ShrimpSaladCircus (author)  jessyratfink5 years ago
Thanks so much, Jessy!