I guess I should've been clearer about the age/context here. There's a period when they'll watch some show on repeat a hundred times. Or a generic cartoon - it doesn't matter when it was produced.

Sure, it will start shifting once they want to watch something their peers watch. But at the time parents choose the media, how would they even know it's not the latest production, or some mix of old/new?

Peppa pig started in 2004. At the time kids are interested in it, if you show them ep 2, will they say "this is not from series 6 from 2019"?