Richard Lugner, 82, wed German TV presenter and former Playboy model Cathy Schmitz, 25, last September after a brief courtship that lasted just seven months.
It is the fifth marriage for the Austrian billionaire and he admits the path to marital bliss has already been rocky.
He told This Morning: 'We have to learn to be married.'
The successful businessman had previously sworn off marriage forever after his fourth divorce, but admits that Cathy managed to change his mind after they started dating last February.
The couple were engaged in August and married a month later.
He said: 'I had been married four times, and when I met Cathy I had been divorced for seven years. I didn't want to get married ever again.'
Despite his misgivings, Cathy managed to change his mind, but Richard admits that he is still very fearful that his new wife is more interested in his bank balance than his personality.
He said: 'I am always worried. 'Ladies are very dangerous - to be married is dangerous. '(But) I like to fight with the young ladies. It's better for me.'
Cathy, who was trying to make her name as TV presenter in Germany before she crossed paths with the billionaire, admits that she loves the luxury lifestyle that comes with being Richard's wife, but that it isn't the reason she married him.
She said: 'When we met I thought he was a nice guy. I knew he was rich, I am from Germany - he is very famous person. Of course it's nice to life a luxury life. But it's not very important to me.
'Before I met him I was pushing my own career on the television. But I had to make a decision between love and my career. (And) I am not the first woman that is much younger than him - none of his wives were as old as him.'
While many would struggle to understand what an octogenarian and a woman in her twenties could have in common, Cathy maintains that it is a match made in heaven.
She said: 'I have a good teacher as he has been married four times before. I dated a lot of young boys – they are only looking out for themselves. They like football and many women. I have a lot of fun with him (but also)I have a six-year-old daughter to look after – I need a man.'
See the gallery below for more pictures of Cathy and her husband.