> Mathematics is such an old field, older than anything except arguably philosophy
If we are already venturing outside of scientific realm with philosophy, I'm sure fields of literature or politics are older. Especially since philosophy is just a subset of literature.
> As far as anybody can tell, mathematics is way older than literature.
That depends what you mean by "literature". If you want it to be written down, then it's very recent because writing is very recent.
But it would be normal to consider cultural products to be literature regardless of whether they're written down. Writing is a medium of transmission. You wouldn't study the epic of Gilgamesh because it's written down. You study it to see what the Sumerians thought about the topics it covers, or to see which god some iconography that you found represents, or... anything that it might plausibly tell you. But the fact that it was written down is only the reason you can study it, not the reason you want to.
> That depends what you mean by "literature". If you want it to be written down
That is what literature means: https://en.wiktionary.org/wiki/literature#Noun
No, the argument is even dumber than that. The person who writes a poem hasn't created any literature.
The person who hears that poem in circulation and records it in his notes has created literature; an anthology is literature but an original work isn't.
> I'm sure fields of literature or politics are older.
As far as anybody can tell, mathematics is way older than literature.
The oldest known proper accounting tokens are from 7000ish BCE, and show proper understanding of addition and multiplication.
The people who made the Ishango bone 25k years ago were probably aware of at least rudimentary addition.
The earliest writings are from the 3000s BCE, and are purely administrative. Literature, by definition, appeared later than writing.