The 28 - year - old Kerber had never reached a Grand Slam final before 2016 .
The 28 - year - old Kerber will turn 29 during the Aussie Open on January 18 .
The 28 - year - old Kerber , who will turn 29 during the Aussie Open on January 18 , had never reached a Grand Slam final before 2016 .