US star David Cassidy’s announcement he is suffering from dementia comes as experts predict the condition will take its toll on more people in future.
There are around 850,000 people in the UK with dementia, according to the Alzheimer’s Society, and numbers are expected to rise to more than one million by 2025, as people live longer.
While it mainly strikes in those over 65, there are more than 42,000 people in the UK under that age with dementia.
He recently revealed he can no longer write.
Other famous sufferers of dementia include the late Baroness Thatcher and Ronald Reagan.
Best-selling author Terry Pratchett died aged 66 in 2015, after a public struggle with Alzheimer’s.
Fawlty Towers star Prunella Scales has also been suffering from dementia.
In 2015, Robin Williams’s widow said a coroner’s report into the star’s death found signs of Lewy body dementia, a difficult-to-diagnose condition which leads to a decline in thinking and reasoning abilities.