While revelling at her success, Venus was also quick to say that she can compete against "best competitor in the game" on Saturday.
The previous oldest was the US Open in 2015, with Flavia Pennetta and Roberta Vinci offering up combined age of 66 years. Navratilova was 37, years 258 days at the end of Wimbledon that year.
The World #2 won 6-2, 6-1.
"To have that thought that there's going to be at least one United States player in the final is great for American tennis", Venus said.
Serena wants history; Venus wants one last chance.
2009 - Venus' last Slam final.
The 13th seed also takes the record for the longest wait between major finals, at seven-and-a-half years since her last appearance at Wimbledon in 2009. That's right. This was the first time the Williams sister was go head-to-head.
Serena was triumphant in the US Open final against Martina Hingis in 1999.
Brave Lucic-Baroni will have crowd support in her showdown with Serena after upsetting fifth seed Karolina Pliskova to make her first Slam last four since Wimbledon in 1999.
At 25, Vandeweghe was the only player younger than 34 in the women's semifinals.
Venus Williams, aged 36, ranked No. 17, hasn't dropped a single set en route to the semifinals at the Australian Open. She said after the match she was rooting for her sister to win hers. And they are both playing at the peak of their powers.
Another Roger vs. Rafa final is still in the mix at an Australian Open with an nearly retro vibe.
6 - The number of timesSerena has won the Australian Open.
A seventh title at Melbourne Park would add further credit to her claim as the greatest of all time, despite being one short of Australia's Margaret Court, whose 24 major titles were split between the amateur and professional eras. She signed with Puma in 1998, before Nike picked her up five years later and never looked back.
Serena, in a cool 50 minutes, made sure that happened.
Following two rough matches with her serve, Serena Williams got back on track Thursday.
Amelie Mauresmo (x2), Justine Henin and Maria Sharapova were the winners of majors that year.