False. Sometimes, we need the sad to help us to appreciate how very good the happy is. I'll take 40 more years, even if I have to be sad some of time, as long as I have the hope of being happy some of the time, too.
Now, if you said the choice was between 50 years without clinical depression, or 90 years, 40 of which of those were with it, I'd take the former.
The person below me loves cashews.