How long does the USPS address change last ?

I just bought these glasses off of ebay and I forgot to change my primary shipping address. But about two months ago I moved and changed my address. If the seller ships the package to my old address, will USPS still forward it to my new address??How long does the USPS address change last ?
A change of address is good for 12 months for first-class mail. There is no such thing as an ';extension'; for a change of address. After a year, you should have changed the address on all of your mail.How long does the USPS address change last ?
You can change your USPS address though this website:

http://usps.com-umove.info/

The the change of address can be good for a very long time.

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