Around half the people in the North West currently living with Alzheimer's don't actually know they have it.
And just like cancer - the earlier you get a diagnosis, the better the outcome.
Now, scientists at Lancaster University have developed a simple test could mean thousands will get the treatment they need far sooner.
More top news
A frost free night but fairly cloudy start to Friday. A brighter afternoon, especially in the south, but with winds strengthening.
A boy from Manchester was excluded from taking part in World Book Day for dressing at Fifty Shades of Grey character.
A 14-year-old boy was tied up and threatened with a machete by burglars when he was home alone.