I know loads of people that have. Some of them are on meds some of them aren't any more. I had terrible depression but I never got help from the Doc and I'm fine now. I volunteer with a charity that uses NLP and challenging team games and stuff, combined with basic communal living in a shared living space over weekends in the countryside in the highlands, and I have to say that green space and wildness is the best cure for any depression. Get him out the house more, go for walks in the country, hire an allotment, anythig like that will help immensely. I think blokes can fall into depression so much more easily these days as we've got nothing to do with our hands, we should be hunting and gathering and making things to protect you, not sitting staring at a screen for hours on end or driving cars or whatever.