When Do You Lose Wakeboarding.

I started wakeboarding when I was 9 years old and I am now turning 21. From the age of 9 until now I have gained an extreme love and passion for the sport. My dad bought me a better boat when I started getting better around the age of 14. By the time I reached 18 years old I believe I was at my best. I was entering outlaw in small local competitions and taking 1st in most. At age 19 and 20 I noticed my time for wakeboarding coming to an end as I had a full time job and my friends grew up and left the scene. Last year ( age 20 ) I went wakeboarding 3 times due to my busy schedule and other road blocks. I was looking at pictures the other day of when I was 18, looking young ( in shape ) and at my very max skill level, I started to feel sad inside thinking about how much fun it used to be and how it felt to be out on the lake with friends. I remember last season when i was 20 I didn't have the endurance and strength of when I was 18 and it was much harder for me. The question I'm getting at is when do you all notice your age take over the sport? I live 30ft off the dock with a boat out front all year and I really hate not getting out to ride anymore.