I am obviously talking about Avengers: Infinity War Thanos, who died in the beginning of Avengers: Endgame.
How old was he when he died? I am seeing all over the internet that he was thousands of years old, but I don't see any proper citation.
I saw his earliest footage when he was conquering Gamora's planet, but that should be few decades ago at most, because Gamora was a little kid at that time.
How old was Thanos when Thor chopped his head off? Any words from writers/ directors/ producers or any educated guess?