Green cards issued between 1979 and August 1989 do not have expiration dates and do not need to be renewed unless you wish to use Global Entry kiosks at international airports in the U.S. you will have to get a replacement card. GE kiosks cannot read the old format Green cards.

If you have a Green card that was issued before 1989 and the photo was taken when you were a child, you may want to renew it even though its not required. If a CBP Officer is unable to identify you from the old photo as the legal owner of the green card, you could be delayed until your identity is verified.

If you have a previous version of the alien registration card (e.g., USCIS Form AR-3, Form AR-103 or Form I-151), you must replace it with a current green card. See USCIS for more information.

https://help.cbp.gov/app/answers/det...xpiration-date

My mother has a green card with no expiration date and it IS still valid. If it's not one of the ones listed above, it will still work, don't listen to people who tell you otherwise.