36-year-old Novak Djokovic is still one of the fittest tennis players there is. He has set multiple records throughout his career and continues to do so. When asked about his longevity, Djokovic said that he still has more plans for the future and looks to win as many matches as possible with the limited time he has in tennis.
With proper fitness and effort towards his wellness, Djokovic has managed to maintain his form even after the age of 30, placing him among the few of the top athletes in the world. Even Djokovic told the Monte Carlo Press that he feels that he has had a better post-30 than before that.