You guys might look at this differently if you still ride when you are nearly 60 years old.
And thanks, SHBR, you have brought up a good point. There is no knee interference, even when out of the saddle on a hill climb. In fact, the bars put your body in a powerful position for out of saddle riding.
That is not that old. I know guys in their 60's and 70's riding drop bars with no issue. Buddy of mine is 54 riding a 49:15 track bike with bullhorns doing 80 mile rides averaging 20.1 mph. Nearly 60? As the years go by, and I am in my mid 40's now, my endurance and condition has only gotten better. If I still ride? I will be riding, but I won't be riding JA bars like those that you posted.