Marmite has an XO version¹, which is aged for a month instead of a couple of days. Not sure I want to try ten year old mitey, but you're here to tell the tale so it must be okay ;)
¹ https://www.marmite.co.uk/products/marmite-xo-yeast-extract-...
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Why on earth is there a dancing jar of marmite taking up the bottom right sixth of the screen, and how do I get rid of it?
I'm interested in what aging means here. Presumably it is different to just 'having it in a jar in the cupboard' because then all jars are aged in the supermarket for a few weeks or more. Looks like I've got my afternoon wikipedia rabbit hole sorted.
From my experience it dries out rather than age, there's far too much salt in to age.