I think contentment is closer to what he's found, his world makes sense in his context and is comfortable and familiar.
Happiness is what you want when you are young, contentment is what you get if you are lucky later.
I think that is how it should be, it's a good progression since too much contentment when you are young would have made me less driven and been less driven wouldn't have helped me reach a point of contentment in my late 30's.
I have a partner who loves me and I her in return, a stable job I enjoy, money in the bank and time and money for my hobbies - it's not euphoric happiness but that never lasts, contentment can.
