Dallas star Patrick Duffy may be almost 80 years old, but he's showing no signs of slowing down! The 1980s sex symbol credits his longevity to his partner Linda Purl who is best known for her character in Happy Days as Henry Winkler's girlfriend. "Linda is reticent to say how much workout that she does do. She cannot sit still. Just before this, she was out climbing a mountain this morning. Wow," he told DailyMail of his partner of five years. He said that Linda has "changed my basic lifestyle that way. I've had both hips replaced and quite literally about two days after I would get home, which was three days after having the hip replaced, I would be on the mountain side climbing a mountain with her, with the doctor's permission." Patrick explained that his lifestyle has now "changed,

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