Its seems that in tennis turning 30 is a major milestone in a player's career.
At this stage in their playing days fans start raising doubts about how long they have left at the sport's top level, it seems inevitable that with age comes a decline in a player's performances.
They lose a step of pace, their serve loses the fluidity it had at its peak and it feels as though they lose that vital extra second they once had to set up their point-winning shots and returns.
However Serena is no ordinary player. By defeating Garbine Muguruza of Spain in straight sets on Saturday Serena now holds all four Grand Slam trophies at the same time. Her achievements are almost nonsensical; she has only ever held all four trophies simultaneously once before in her career, during the 2002-2003 season.
Now, 12 years later, after overcoming injuries, an aging body and nerves, Serena, once again, stands alone as the undisputed greatest player of her generation.
There may be arguments that her opponent in the Wimbledon final was relatively unknown, the 20th seed who had never reached the final of a Grand Slam before, but Williams' route to the final was far from an easy one - it serves as a sure indicator that Serena's greatest achievement was a well earned one.
On route to the final she overcame three former world number ones: her sister Venus Williams, 2004 champion Maria Sharapova and two time Grand Slam champion Victoria Azarenka. Williams had history against all three of these opponents and it was fitting she had to overcome these challenges and a 21-year-old Garbine Muguruza, one of the brightest talents of a new, younger generation, to prove herself as the best once again and possibly for a long time yet to come.
While many would settle for the 'Serena Slam' being the highlight of their career Williams already has her sights set on two even more mouth-watering achievements.
A win in Flushing Meadows later this year would complete a calendar-year grand slam, an achievement not seen since 1988. Not only this but Serena is only one grand slam victory away from drawing level with Steffi Graf with 22 major championship victories.
To top it all off Serena Williams also became the oldest female winner of a Grand Slam in the Open Era, a record we suspect she will probably topple again at the US Open or during next year's season as one thing is inevitable: Serena is going to keep on winning for sometime yet.