At the age of 44, Indian doubles specialist Rohan Bopanna is still going strong, though. A season that included Bopanna’s first Grand Slam men’s doubles title with partner Matthew Ebden at the Australian Open in January — which made him the oldest man to win such a trophy and the oldest to reach No. 1 in the doubles rankings. This week, Bopanna and Ebden are playing at the ATP Finals, the season-ending event for the year’s top eight teams.