I started a food blog about 12 years ago when I was in my forties before blogging was really a thing you did for money. Many of the posts are evergreen and still generate hundreds of dollars a year without any input from me. I still write new content that takes me maybe 3-4 hours a week to maintain this website (I'm not retired yet. I still have a full time job but will retire in about five years). I could probably keep doing this for another twenty years. I make about $12k a year on it and if I put more time into it, I could probably double it. The only passive income is if you are born wealthy or have something like a trust fund.