I agree that Don looks great and that his boots are cool!
Don said on the Howard Stern show in 2008 that Kathrin was 42, so she must be 49 or 50 now.
You can hear Don talking about her from around 0:50 to 1:15 in this video from the Howard Stern show:
www.youtube.com/watch?v=X7WlJJVLYS8