Around 150,000 people have a stroke each year in the UK with about a quarter of these in people of working age, according to the Stroke Association.
Its director of communications, Joe Korner, said:
We are deeply saddened to hear about Andrew Marr's stroke and our thoughts are with him and his family at this hard time.
A stroke happens in an instant but the effects can often last a lifetime.
However with the right care and support it is possible to make a recovery and return to a life after stroke.