Well, Lex Luthor started out in a rather difficult situation. In his origin story, he was from a not - so - well - off family in a tough neighborhood. However, his genius was evident from a young age. He managed to build an empire through his wits and business acumen. But his encounter with Superman, a being with god - like powers, made him feel inferior. This sense of inferiority and his overarching ambition led him down the path of villainy. He began devising plans to take down Superman, believing that without Superman, he could be the most powerful and respected figure in the world.
I'm not sure specifically who 'Lex' you mentioned is. There could be many people named Lex. Maybe he's a character from a certain book, movie or someone in your personal acquaintance. Without more context, it's hard to tell his back story.
Clark and Lex were friends at the beginning in the comics. But as the story progressed, Lex's character changed, and they became enemies. This transformation was driven by Lex's mistrust and his own ambitions.
Yes, in some storylines, Lex and Superman can be portrayed as having a complex relationship that might involve moments of friendship or uneasy alliances.
Lex Luthor's age isn't fixed in the comics. It can change based on the creative direction of the writers and the era of the story. Generally, he's portrayed as an adult in his prime, often in his late 30s to 50s.
It can be disrespectful to the original source material and the intentions of the creators. The character of Lex Luthor has complex traits that should be explored in more meaningful ways.