teach an old dog new tricks

when someone does something for a long time and its hard to teach them new abilities.

you cant teach an old dog new tricks, my uncle never learned how to use his cellphone.

Old News Feed

When someone brings up information about a Facebook status, profile, or update, which is at least 3 days old.

Don: Did you hear about Franks mom?

Paul: Man, that's Old News Feed, she's always been hot.