At 36 years and 322 days, Djokovic is the oldest leader in the history of the ATP list and very likely in the next period he will further improve this achievement because he has the opportunity to stay in the first place for a few more weeks. The last time Federer was in the first place was on June 24, 2018, after which his position was taken by Nadal, and then Djokovic returned to it and stayed there for a year.