On forgetting that football existed prior to 1993! "Newcastle relegated after 16 years in the Premier League", after I'd just said to the missus that they'd gone down after about 20 years in the top division - so then I had to explain the formation of Premier League!
Technically it's 20 years in the top flight. What they decided to call the top flight is irrelevant. Edit: It is actually 16 seasons in the top flight. They got promoted from the 2nd tier at the end of 92/93.
As I said to the missus - it's a technicality. But surely it would have been more dramatic to say "after 20 years in the top flight"