Pythagoras lived from 571 BCE to 495 BCE, so he was about 76 when he died.
Pythagoras and his students are often said to have constructed the first proof of this useful theorem. Pythagoras had a school with many students. but the school was secretive, and the students gave their teacher for what they discovered. Because of this, we don't know exactly who did what and when.
In any case, it is clear from their clay tablets that the Babylonians knew and used the theorem we call "Pythagoras' Theorem", about a thousand years earlier. They also knew some kind of proof.
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he was about 48-49 years of age jk
Pythagoras IDIOT Actually "The Chinese also knew this theorem. It is attributed to Tschou-Gun who lived in 1100 BC." Quoted from http://www.arcytech.org/java/Pythagoras/history.HTML
There are 19 various aspects of Pythagoras theorem. Pythagorean Theorem (1) Pythagoras Theorem(2) Pythagorean Theorem (3) Pythagorean Theorem (4) Pythagoras Theorem(5) Pythagorean Theorem(6) Pythagrean Theorem(7) Pythagoras Theorem(8) Pythagorean Theorem (9) Hyppocrates' lunar Minimum Distance Shortest Distance Quadrangular Pyramid (1) Quadrangular Pyramid (2) Origami Two Poles Pythagoras Tree(1) Pythagoras Tree(2) Theorem by Pappus
~The Pythagoras theorem
Although t is known as Pythagoras' theorem and thus about 2500-2600 years old, considering Pythagoras lived between 5th and 6th century BC, it was known before this. There is evidence that the Babylonians of 20th to 16th century BC (some 1000 years before Pythagoras) knew it, making it about 3600-4000 years old.