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David Cassidy has revealed that he is battling dementia.

The actor, 66, was a huge teen hearthrob in the 1970s during (and after) his stint on the series “The Partridge Family.”

Both Cassidy’s mother and grandfather battled the disease. He revealed to PEOPLE that he was in denial but always knew he’d end up with dementia.

Just this past weekend, during a show in California, Cassidy had trouble remembering the lyrics to songs he has been singing for decades. Cassidy has now decided to stop touring, musically, to focus on his health.