"It's amazing," Pennetta said.
"I think when you're old, you're starting to have different goals and try to enjoy a little bit more the life.
"Also, when I was young, for me it was really easy to stay few months out of my house, don't see my parents. Now everything is starting to be difficult. I love to come back. I love to spend time with them most of the time.
"And so I'm here, and try to play my best tennis, try to enjoy every moment and my best."
Pennetta and Li have split their four previous meetings and their next encounter represents a golden opportunity for whoever nudges ahead in their careers series.
With world No1 Serena Williams usurped from the top of the draw, Li or Pennetta will instead face either 14th seed Ana Ivanovic or Canadian teenager Eugenie Bouchard for a place in Saturday night's final.
Pennetta believes her history with Li will be irrelevant when they take to the court today.
"We didn't played in the last two or three years, so it's going to be, I think, a completely different match," she said. "She is so good. Like she's one of the best players. Backhand, unbelievable; forehand, really good; physically she's strong.
"So it's going to be really a good fight on the court."
Li Na v Flavia Pennetta
4-Li Na (CHN) v 28-Flavia Pennetta (ITA) 2-2
2010: Sydney, hard, R16, Pennetta 6-2 7-6 (7-4); 2006: Sydney, hard, R32, Li 6-4 6-1; 2006 Gold Coast, hard, R16, Pennetta 6-2 6-2; 2000: Civitanove, clay, R16, Li 6-4 6-1
Li Na
Age: 31; Ranking: 4; Plays: right-handed (two-handed backhand); Career prize money: US$13,410,352; Career titles: 8; Grand slam titles: 1 (French Open 2011); Australian Open win-loss record: 31-8; Best Australian Open performances: finalist 2011, 2013
Flavia Pennetta
Age: 31; Ranking: 29; Plays: right-handed (two-handed backhand); Career prize money: US$7,403,667; Career titles: 9; Grand slam titles: 0; Australian Open win-loss record: 13-10; Best Australian Open performances: quarter-finalist 2014
- AAP