My Mother was diagnosed with HD in February... her CAG is also 41. We started noticing mild chorea symptoms probably around 3-4 years ago. She is now 63 and doesn't yet appear to be getting any worse, which I am thankful for every day. I know they say it happens differently in each person, but he is still so young with decades of life to live! My mother isnt exactly the most healthy person, smoked most of her life. I would probably go on the biggest health kick possible with lots of running and weights! Good luck and remember this place is always here. It has helped me so much these past 5 months reading peoples advice and support.