Lmao you absolutely can, just there’s not much point as both the reaction that creates the petides and the cheese crystal formation will be over long before even 5 years. So you won’t see much difference or may even deteriorate over time.
What UK cheese maker does 20 years? Hook’s is the only one I could find, and I pick that up at my local farmer’s market.
There is certainly a difference between 5 and 7 years. I’ll admit the difference between 7 and 20 is diminishing returns, but it’s there.
It’s usually not the maker that ages them for so long but the mongers who will buy vintage cheddar and then continue to age it to sell for a premium, there’s a couple of places in london I know that would sell at least decade aged cheddar, one on jermyn Street and another in knightsbridge. But I havnt been to either in a long time so idk if they still do it.