I can only speak for England, personally.

There’s plenty of phrases that seem outdated now. My parents are cockneys, so I picked up a lot of rhyming slang growing up… that is definitely dying out 😅

But, simpler words have changed too - mainly nouns. For example: cinema (used to be the pictures), phone (used to be mobile phone). I’m sure there’s plenty more… but it makes you realise just how much has changed.