I started meditating when I was a young teen, and am 40 now. I go through periods where I don't do it as much, but I've been off and on meditating for quite awhile. Not so much 'mindfulness' meditation as has become the trend lately, but more of the 'empty of everything' style where you count breaths, etc. Fairly similar in results though it seems. Same avoiding of engaging with random thoughts that float by, which was probably the biggest thing I got out of it. Especially when I am stressed, it can become very difficult to sleep as my mind just won't shut down. Meditation helps with that.

I don't know if it is meditation or more my studying of philosophy (both in college and on my own time) that has led to my ability to control my emotions better. I would also say my emotions are ephemeral, but that's really because I understand them better. When they are justified, and helpful, I can nurture them and encourage them and indulge in them just fine. And if they're not, usually I can let them pass. There are exceptions, of course, for deep-seated things that I need more repeated attempts at suppression to change. Emotions are essentially a trained response, after all. Even if you intellectually know they're nonsensical, it has to be retrained.