Michael Douglas is facing growing speculation about his health and marriage, with sources saying the 80-year-old actor's retirement and "creeping mortality" have become the unspoken strain in his relationship with Catherine Zeta-Jones , RadarOnline.com can reveal.

The Osca r-winning star, who unofficially confirmed in July he was stepping away from acting after nearly 60 years in the industry, has been seen holidaying alone while Zeta-Jones, 55, has reignited her career with major roles in Netflix’s Wednesday , Amazon’s upcoming Kill Jackie , and the feature film The Gallerist . Article continues below advertisement

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