Thanos is a well - known character in the Marvel universe. Old King Thanos is a version of him from an alternate future. In this story, he has already decimated half of all life in the universe long ago. He's a powerful and feared figure. He's seen as a sort of dark, tyrannical king. His actions are often driven by his warped view of bringing 'balance' to the universe.
Old King Thanos is characterized by his single - minded determination. He is completely convinced that his view of the universe is the correct one, and he won't be swayed. He is also a very old and battle - scarred figure. His appearance reflects the years of conflict and destruction he has been involved in. His rule is tyrannical, as he doesn't really care about the well - being of the remaining life in the universe, only about maintaining his version of 'balance'.
Thanos' age in the comics is sort of ambiguous. He's been involved in countless cosmic battles and has a history that goes back eons. So, there's no straightforward answer for his age exactly.
He was probably a just person. He would have made fair decisions in disputes among his people and ensured that the law was applied equally to everyone in the kingdom.
Maybe his greatest achievement was uniting the divided kingdoms under his rule. By doing so, he brought peace and stability to the land which had been torn apart by wars and power struggles among different regions.