liautiamding

這裡面寫的一清二楚！

重點就是這三個Q&A:
Q:Do I need to renew my Green Card if it was issued between 1979 and 1988 but does not have an expiration date?

A:No. Green Cards issued between 1979 and 1988 do not have expiration dates and do not need to be renewed at this time. USCIS will develop a plan for replacing these cards at a future time.

Q:Will I lose my permanent resident status if I do not renew my Green Card?｛版主譯：如果我沒更新我的綠卡, 我會失去我的永久居民狀態(永久居留權)嗎？}

A:No, you will not lose your permanent resident status if you do not renew your Green Card–your permanent resident status will not expire or change. (版主譯：不會)However, you are required by law to carry evidence of your status/registration (e.g. a valid, unexpired Green Card or the temporary proof of status you receive at the time of filing to renew your Green Card.)

Q:What will happen if I do not renew my expiring Green Card?

A:If you fail to renew your expiring card, you may experience difficulties in obtaining employment, benefits and re-entry into the United States from abroad.

精準一點講應該是1989以後發行的綠卡才有過期(expiring date)的問題，但是不會影響永久居留的身分。
而且1989以前發行的根本沒所謂的expire(過期)的問題。

from：王逸峰的Blog　綠卡的永久居留權，不會自動失效！