It is a fact of life that age and circumstances catch up to all athletes at some point.
Some have greater staying power than others, but eventually, even the best of drivers have to realize they will never be relevant again. They may show flashes of their old winning ways, but they'll never be seriously mentioned in championship conversations or be consistent front-runners from week to week.
Occasionally they hang on longer than they should, a situation that happens in NASCAR to a sometimes embarrassing extent. No one likes to see a former championship-caliber driver puttering around the back of the pack.
For the most part, the drivers on this list aren't at that point, and I'm not saying they should hand over the keys right away. I'm just saying I don't see them being considered as top drivers in the sport for the rest of their careers.
A few of the drivers on this list are aging veterans who were recently considered to be some of the top drivers in the sport, while others are younger drivers whose careers I believe are on the downswing.
I'm sure that some will disagree with my analysis, and I might be proved wrong if one of these drivers has a career resurgence. I just don't see it happening.