be a millionaire before 40

I’m not trying to amass as much money as humanly possible, greed is not the motivation. I want enough to not have to rely on the pension when I get old, and so I can help my family who’ve had nothing all their lives (having lived in Eastern Europe). I’d also love to see the world instead of just dreaming about it, and be in a position to financially support several causes important to me. Perhaps I need to become a billionaire instead…