Serena is the third oldest female Grand Slam finalist in the Open era at 36 years and 291 days.
World number one Simona Halep set up an Australian Open final against Caroline Wozniacki after a thrilling 6-3, 4-6, 9-7 battle past former champion Angelique Kerber on Thursday.
Angelique Kerber became the first top seed to lose in the opening round at Roland Garros on Sunday as tearful Petra Kvitova swept to victory in her first match since surviving a knife attack which almost ended her career.
Serena Williams beat Germany's Angelique Kerber 7-5 6-3 to claim a seventh Wimbledon singles title and equal Steffi Graf's professional era record of 22 grand slam singles crowns on Saturday.
World number three Angelique Kerber beat qualifier Laura Siegemund 6-4 6-0 on Sunday to defend her Stuttgart Grand Prix title and end her opponent's sensational run.
Angelique Kerber stunned Serena Williams to win the Australian Open on Saturday and thwart the American world number one's bid to equal Steffi Graf's Open-era record of 22 Grand Slam titles.
Seventh seed Angelique Kerber tamed British hope Johanna Konta to reach the Australian Open final on Thursday, where she will face dominant world number one Serena Williams.