35 year old mother from Haywards Health has been talking to ITV Meridian about how she's coping with a diagnosis that means she could have dementia by the time she's 45.
A rare gene runs in Hannah Mackay's family.
Her father and grandfather developed the condition in their fifties and it means that both her daughters are also at risk.
Nearly a million people in the UK currently living with Dementia.
- Watch this report by Jenna Verdiccio:
Hannah Mackay is 35 and has been told she could develop dementia within just 10 years.
It was after Hannah learnt she had a 50-50 chance of developing the condition that she decided to remove uncertainty over her future by undergoing genetic tests.
- Hannah Mackay, diagnosed with Dementia:
Hannah's father and grandfather were both diagnosed with dementia.
Her grandfather died at the age of 57.
Hannah now faces the heart breaking knowledge that her two daughters also have a 50% chance of getting the condition.
Part of Hannah's challenge now is to raise awareness and change misconceptions of the condition.
- Hannah Churchill, Alzheimer's Society:
Hannah is now fundraising and taking part in a memory walk in Brighton.
Her aim is to raise millions of pounds for the Alzheimer's Society.
Her hope is that a cure can be found by the time her girls grow up.