when do you start feeling your age?

I just turned 30 I own my own business that does very well for my family and I. I am always going 100 mph. When I am not going 100 mph at work, I am rock climbing, sky diving, wake boarding, snow boarding, bow hunting, hiking, camping, fishing, boating, riding motorcycles or go-carts or snow machines. I have been taking great big bites outta life. When will I really notice age? What hits you first?