Fortunately, there are Tamil poems written around 200 CE that are still readable and understandable by native speaker. Tamil poems follow strict grammar and structural rules for poems, so they don't change over time (see: https://en.wikipedia.org/wiki/Venpa).
Here is poem that speaks about children being joyous, and how they playfully eat food. A simple ordeal in everyday life. Its about 7 lines and everyday speaker still understands all of it.