Slowing down

In my teens / preteens, I was a prolific writer. In fact I wrote a 32 page novel. Since then, I've slowed down. Damaged brain cells? I don't think so. What happened then? Something also happened in online Poker - my chips levels stagnated. My midriff's expanding, I'm not exercising, not drumming, not walking, not doing anything intense. I've been lining more than my share of 0.27% of my life on facebook. Wake up!