While a Permanent Resident card or “green card” is proof of permanent residence, it is not permanent proof. A 10 year green card will need to be renewed every decade. It can take over six months to replace a green card, and USCIS allows beginning the renewal process 6 months before expiration. It is very wise to begin this as soon as they will allow it.
A 2 year (“conditional”) green card cannot be renewed, the conditions must be removed or the immigrant will lose their permanent resident status.
How to renew green card?
Form I-90 can be e-filed online or sent in paper. If you are outside the United States and your green card will expire in the next six months, you should file for a renewal card as soon you arrive to the US. If it expires while you are overseas, you will need to contact a US consulate, USCIS office, or port of entry before filing I-90.