I thought @
thehammerdog had just taken a bad fall, causing him to back off on aggressive riding. That's happened to me in mountain biking. Now in my 60s, I'm not nearly as reckless as I was in my 40s.
As for autumn, it's my favorite time of year to ride. The air is cooler and significantly drier in the DC/Virginia area. That's a huge factor for my enjoyment. I love fall because the scenery gets transformed from lush green with its loamy scents and dull insect buzz to varied colors, cool breezes and the first whiff of leaves decaying.
Not so sure about mojo, but I hope that this helps the discussion. PG