It depends on whether certain ancient artifacts found more recently are deemed to be true "written language" or not

There have been sketches on 60,000 year old egg shells, though it is not yet viewed as legitimate written language.

# Jiahu Script, symbols on tortoise shells in Jiahu, ca. 6600 BC

# Vinča script (Tărtăria tablets), ca. 5300 BC[6]

# Early Indus script, ca. 3500 BC

- also under debate

Symbols have been found dating back to 30k years ago and some evidence of 7k year old writing exists as well

We don't really know for sure but research and time will continue to expand current knowledge and dating methods should certainly improve as well.

Put it this way, only a century or so ago, it was commonly believed there was no authentic well developed writing system at all before around 1500 B.C.! They were wrong, and we are no doubt still to find earlier writing.

Alcohol is a naturally occurring substance. Man discovered it by accident, and then learned how to manipulate the natural events to ferment all sorts of things. Yeast converts sugars into alcohol and carbon dioxide. Many liquids have sugars, including milk, fruit juices and malts. The history of brewing, and later distilling is long and interesting. Searches on fermenting and distilling will lead you to many web sites that can provide long histories of various types of liquids.

Writing systems were preceded by proto-writing, systems of ideographic and/or early mnemonic symbols. The best known examples are: * Jiahu Script, symbols on tortoise shells in Jiahu, ca. 6600 BC * Vinča script (Tărtăria tablets), ca. 4500 BC * Early Indus script, ca. 3500 BC The invention of the first writing systems is roughly contemporary with the beginning of the Bronze Age in the late Neolithic of the late 4th millennium BC. The Sumerian archaic cuneiform script and the Egyptian hieroglyphs are generally considered the earliest writing systems, both emerging out of their ancestral proto-literate symbol systems from 3400-3200 BC with earliest coherent texts from about 2600 BC. Though the Ge'ez writing system of Ethiopia is considered Semitic it is likely of semi-independent origin, having roots in the Meroitic Sudanese ideogram system.[1] The Chinese script likely developed independently of the Middle Eastern scripts, around 1600 BC. The pre-Columbian Mesoamerican writing systems (including among others Olmec and Maya scripts) are also generally believed to have had independent origins. It is thought that the first true alphabetic writing appeared around 2000 BC, as a representation of language developed for Semitic slaves in Egypt by Egyptians (see History of the alphabet). Most other alphabets in the world today either descended from this one innovation, many via the Phoenician alphabet, or were directly inspired by its design.

Sumerian is considered one of the world's oldest written languages, dating back to around 3200 BCE in ancient Mesopotamia. It is known for its cuneiform script and was used in ancient Sumer, located in present-day Iraq.