I started playing when I was 12 and continued until I graduated from college. I did play in a city league several years after college, but was really out of shape. Now, I satisfy my soccer longings by juggling the ball by myself or kicking it back and forth with my kids.
I played at USC way back in the day, but we were a club at that time. I still play now, but only because it was never close to my best sport and it is still a challenge for me try and be better (plus it is easy to find games in Florida year round).
I played pickup games at some local fields for a large part of my twenties, it's not my best sport but I started to get pretty good in my late 20s...
I like it more than basketball which I was really good at just because I kept getting in fights playing pickup basketball, the ratio of pricks to cool guys is a lot higher with basketball than it is with soccer in my experience.
I haven't played in like 5 years now since the police started cracking down on "unlicensed" field use. Theirs only 1 field where we can play now within a 10 minute drive of my house and it has no goals, horrible grass and usually 30 guys minimum every day trying to play 1 game. You're lucky if you touch the ball once every 5 minutes.
Many moons ago, I wanted to play soccer in high school, but my school did not have a team. I tried to start one, but everyone I knew, including faculty, talked me out of it. Ironically, they started a team two years after I graduated.
My university had a soccer club team, but I did not play then because I always took too many credits to do anything other than study.
A couple decades later, I had to stop playing softball because I blew out my throwing arm. Bored and feeling sorry for myself, I watched the World Cup and realized that I did not need a throwing arm to play soccer. Then, after watching Fox Soccer Channel for a few weeks, I bought my first soccer ball and started training by myself for the next several years because there are no adult leagues where I live.
Eventually I found an adult soccer league in a town 50 miles away, and for one glorious summer, I played every week for a team of fellow O30s, both outdoor and indoor, and enjoyed every wheezing, coughing minute of it. Although I had never been coached in my life, I had watched enough soccer on TV, read enough books and practiced enough on my own to have more good moments than bad. I may be old, but I am slow, and I became a master of the offside trap (if I do say so myself). :]
Since then, I have played random pick-up games in the park once in a while, but nothing organized, which is what I really miss.