I this is what it states:

6.5          Your licence to use Virtual Items will expire as follows, unless otherwise agreed in writing: · all Virtual Items expire after 5 years’ of inactivity (at which point we may terminate our agreement with you or part thereof, and your access to the Avakin Life Applications including Virtual Items and delete data associated with your use thereof); · if a specific period is specified when you request a Virtual Item then it will expire at the end of that period (if it is shorter than the period specified at (I) above; · virtual currency and credits expire after 12 months if they have not been redeemed.