I'm 22 and I told a couple coworkers at lunch that I wish I could do my job part time, and that I'd give up half my salary to just have all that free time back. They thought I was crazy.
Kudos to you if you manage half time.
If you want to do it, see if your employer would allow it. Don't regret not doing so ten years down the track.
I like programming, but sometimes I wish I could do it only a few days a week and spend the rest doing something where I wasn't hunched over in front of a box 13 hours a day. Sales! Photography! Helping injured animals! I've never done anything that didn't involve sitting alone a desk all day...