I don't agree. Not only has my balance improved over the years (I started when I was 27, now I'm 43), I also started surfing when I turned 41. I thought that was going to be a real laughing matter! My wife has been surfing for a few years and she talked me into going. I'm already working on some maneuvers. I'm having a blast and have been getting praise from my instructors on my balance on the board.
Duuuuude...I have been surfing since I was a boy started Aikido in my late 20's both complement each other very very well....
Welcome to 'The Church of the Blessed Open Sky."
And surfing with your wife. Awsome. !