Mel Gibson has been spending time with his girlfriend Rosalind Ross and daughter Lucia, and he's set to debut his first directorial effort in 10 years, Hacksaw Ridge

Credit: Stephane Cardinale - Corbis/Getty Images

Mel Gibson is back in the director’s chair.

After a 10-year hiatus from behind the camera, Gibson marks his latest directorial effort with the World War II drama Hacksaw Ridge, which is set to premiere at the Venice Film Festival on Sept. 5.

And as Gibson’s professional life continues to ramp back up, a source tells PEOPLE the actor is happy in his personal life as well.

“Mel is doing great,” says the source. “He has been taking care of himself.”

Gibson, 60, has been romantically linked to 25-year-old Rosalind Ross for about a year, and the two spent time together in Australia while he filmed Hacksaw Ridge.

“Dating Rosalind is keeping him healthy. She is a total catch and Mel has been very well-behaved. She is great for him,” says the source. “In the past year, Mel spent a lot of time in Australia and Rosalind has joined him. She has her own life, but also seems to enjoy Mel’s.”

And despite their age gap, the source says the couple’s relationship continues to flourish.

“Although Rosalind is much younger, they are still very much on the same page. She likes to live a more quiet life. They work, travel and spend time at home in Malibu together.”

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Hacksaw Ridge is based on the story of Desmond Doss, a World War II Aarmy medic who is credited with saving 75 lives during the Battle of Okinawa in 1945 and became the first conscientious objector to receive the Congressional Medal of Honor. Andrew Garfield portrays Doss in the film.

The $40 million picture marks Gibson’s return to directing since 2006’s Apocalypto. He has acted in various films during the hiatus, including The Expendables 3 in 2014 and Machete Kills in 2013. He is also set to star alongside Sean Penn in the upcoming film The Professor and the Madman.

“Mel still loves acting,” adds the source. “He is preparing to film in Europe with Sean Penn. He also enjoyed directing in Australia.”

Gibson’s latest acting role, as an ex-convict out for revenge in the thriller Blood Father, earned him positive reviews from critics.

The film is “worth checking out just to be reminded how powerful an actor Mel Gibson continues to be even – if the parts aren’t coming like they once were,” wrote Entertainment Weekly.

But when he’s not working, Gibson’s focus is on his 6-year-old daughter, Lucia, whom he shares with his ex Oksana Grigorieva.

“Mel is a great dad to her,” says the source. “When Mel directed on location in Australia, Lucia spent a lot of time there. She is sweet, very social and seems very happy to spend time with Mel. Lucia had a nanny with her in Australia and visited Mel on the set. When Mel was off, they did normal kids’ stuff like pick up ice cream.”

After an extended custody battle with Grigorieva, the California Court of Appeals recently ruled that Gibson would not have to pay $500,000 worth of settlement money after the Russian singer broke the terms of their agreement.

“Mel and Oksana are not getting along,” says the source. “It’s a constant fight about the custody arrangement and money.”