"He's going to be 103 in December," Douglas said of his father. "He's incredible. He doesn't get around a whole lot but his mind's all there, so I got him an iPad and I got him FaceTime."
Douglas said his dad, who lives on the west coast, has a habit of calling him and his wife, actress Catherine Zeta-Jones, when it's late on the east coast.
"Loves it. It's fantastic. The only problem is that we're three hours difference -- I'm east coast here, he's there," the star said. "We're relatively early to bed. We tried to explain to him that it's after 10 o'clock, 7 o'clock your time."
"He loves it. So I'll say, 'Hey, dad. How are ya?' 'Fine. Where's your wife?' 'Here's Catherine.' 'Hi, honey!' He's still flirting," he added with a laugh.
"Having a younger bride makes me feel good on one side," he said, referencing Zeta-Jones, who is 25 years his junior. "I've got the old man over here on the other side who still has a full head of hair."
Douglas stars in the Netflix series The Kominsky Method, which will premiere a second season Friday.