Williams is now the oldest player to reach a Wimbledon semifinal since Martina Navratilova 23 years ago.
In the context of her battle with Sjogren's Syndrome, an autoimmune disease, and the distraction of an impending lawsuit over her involvement in the death of a 78-year-old in a car crash, that is all the more impressive.
The secret to such longevity and single-minded focus, she says, is simply love.
"I love the challenge," Williams said. "I love pressure. It's not always easy dealing with the pressure. There's constant pressure. It's only yourself who can have the answer for that. I love the last day you play, you're still improving. It's not something that is stagnant. There's always a reason. You have to get better. I love that.
"I don't think about the definition of age. It's beautiful to be at all ages really. That's my experience so far."
She has to get past tournament darling Konta, who had British fans in a state of delirium with a pulsating quarter-final win over Romanian second seed Simona Halep.
Konta battled back from a set down to clinch a Centre Court thriller 6-7 (2-7), 7-6 (7-5), 6-4 to become Britain's first women's semifinalist since Virginia Wade 39 years ago.
"It's a little bit surreal," Sydney-born Konta said.
"I felt very clear about what I was trying to achieve out there. I continued to trust in the fact that what I was doing was going to bring me good things."