Will Smith struggled to keep up with his younger co-stars on the set of 'Suicide Squad'.

Will Smith

Will Smith

The 47-year-old actor - who plays antihero Deadshot in the DC Comics blockbuster - has admitted he required plenty of shuteye after partying with his castmates including Cara Delevingne, 23, and Margot Robbie, 26.

Speaking at the European premiere of the movie at London's Odeon Leicester Square on Wednesday night (03.08.16), he said: "I'm 47. Do not hang out with 20-year-olds. Do not do it.

"It ruins every aspect of your 40-year-old life when you try to hang out with 20-year-olds.

"I had about six weeks on set when I was like: 'I can be 20, this is fun'. But from tattooing, to working 14-hour days and then hanging out for four hours, and parties on set... I need a nap."

'Suicide Squad' sees him reunite with his 'Focus' co-star Margot and he recently recalled being unimpressed by the blonde beauty when they first met - while she was annoyed by his tardiness.

Interviewing one another for E! News, Margot said: "When I first met you it was for the audition for 'Focus' and you were late. I'd come from Croatia and I remember being like 'Why is he late? I should be late.' "

Will retorted: "At least I was dressed for the interview. She walked into the audition and she had shoes like she'd walked through mud, shorts on, her hair wasn't done, I was like 'She doesn't want this at all.' "

But Margot insisted she had a good explanation for her unkempt appearance.

She said: "I'd lost my luggage. I'd been backpacking."

Margot also criticised Will - who has son Trey, 23, from a previous marriage, and Jaden 18, and Willow, 15, with wife Jada Pinkett Smith - for his lack of manners.

She said: "I hate it when you say 'huh?' It's rude.... Maybe I shouldn't be scolding a man that's twice my age."

Will added: "Somewhere as a child, Margot wasn't allowed to say 'Huh?', she had to say 'Pardon?'. It's a habit. She [shouts] 'It's pardon!'"

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