Ron Galella/Ron Galella Collection via Getty; Tommaso Boddi/WireImage Malcolm McDowell has been married to Kelley Kuhr for over three decades, with the pair tying the knot in 1991 The veteran actor opened up about his and his designer wife's marriage secrets in an exclusive interview with PEOPLE McDowell shares three sons with Kuhr, a son and daughter with ex-wife Mary Steenburgen, and he has four granddaughters Malcolm McDowellis spilling his marriage secrets. While chatting with PEOPLE about his newly released movieEt Tu, the Hollywood veteran, 82, also opened up about his family life and three decades of marriage with his wife, Kelley Kuhr. When asked about the secret to a longterm love, McDowell, who tied the knot with Kuhr in 1991, offered a humble response. "You know what? Honestly, I am not an expert on relationships," the star tells PEOPLE, adding, "I wish I was." "And I think just liking the partner you're with is very important and just respecting," he says, adding that he is "very lucky" in that department. "My wife's a brilliant designer and at the moment, she's doing this house in Mexico, which is her masterpiece. It's an amazing thing that she's done and I'm so proud of her," he adds of Kuhr. TheTank Girlactor went on to point out that while he and his longtime love are not in the same field of work, they do have some shared loves — including spending lots of time in antique shops. "She doesn't do what I do, but she's just as successful in her own way and I'm in awe of what she does. It's amazing. I don't know how she does it, but she does it," he says of the designer. "But we also, we're collectors." Tommaso Boddi/WireImage "We collect stuff," he tells PEOPLE, "and we pretty much collect and like the same stuff, which is lucky." That, and it's "a lot of fun," he adds. The couple "always have fun wherever we go," says the Hollywood vet "always straight to the antique shops and hunting around and having fun that way. It's great." Malcolm and Kuhr are also parents,sharing three sons: Beckett, 21, Finn, 18, and Seamus, 16. He is also a dad to daughterLilly, 44, and sonCharlie, 42, with ex-wifeMary Steenburgen, and a grandfather to four girls. Elsewhere in his chat aboutEt Tu, the actor opened up about his "absolutely gorgeous" baby granddaughter, Tove, whom his son Charlie recently welcomed with his wife, actressLily Collins. The coupleannounced that they had welcomed a daughtervia surrogate in January. Eric Robert/Sygma/Sygma via Getty "She's absolutely gorgeous," McDowell tells PEOPLE of the little one. "Absolutely beautiful." Of his granddaughters, the actor says, "I love being around them and just watching the antics that go on and the dynamic and the difference between them all. It's staggering." Never miss a story — sign up forPEOPLE's free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from celebrity news to compelling human-interest stories. "They're so different in personality and everything. It's just beautiful to watch," he adds. Et Tuis available to streamand purchase now. Read the original article onPeople