He inherited the condition from his father Adrian, who died of the disease aged just 36.
Those with this type of Alzheimer’s, known as PSEN1, tend to have the same life expectancy as the person they inherited it from.
Doctors have warned that Daniel’s young toddlers Lola and Jasper have a 50 per cent chance of inheriting the disease.
He and partner Jordan Evans are now determined to make lasting memories for their family before his own fade by raising money for the trip of a lifetime.
He said: “I try not to think about it. I live day by day with both good days and bad days. “It does not just affect me, it affects everyone around me as well. “I do not know how long I have till it takes a real hold on me. I want to be as much of a dad as I can for as long as I can be.
“As my memory fades I am hoping to create lasting memories for my partner and our children so that one day they can look back on the videos and photos of us all together and cherish them.”
Like other Alzheimer’s patients, Daniel, of Nottingham, suffers from short-term memory loss, confusion and problems with his balance. It is likely to deteriorate quicker due to his young age and will ultimately lead to his death.
He was warned there was a chance he had the condition when Jordan was four months pregnant in early 2016 but decided not to get tested at the time.
However, shortly after the twins’ first birthday, his symptoms started becoming more serious and he went to get a diagnosis, finding out that he had been living with the degenerative condition for a year.
Then came the double blow that, because his type of Alzheimer’s is inherited, there is a 50 per cent chance it will be passed on to his two children.
They cannot be tested for the gene until they are 18 due to laws on patients finding out about genetic conditions. Daniel’s brother Sean, 28, has been given the all-clear but younger sibling Alex, 23, has decided he does not want to find out.
NHS worker Jordan, 29, said the family were now in a race against time to make cherished memories before Daniel becomes too ill.
She said: “We were very shocked and devastated by the diagnosis. It was particularly difficult to hear that the children have a chance of getting it too.
“We have tried to find out about getting them tested for the gene but they cannot legally be tested until they are 18 and they must make the decision for themselves.
“Daniel’s dad died in 1999 but at the time the cause of death was put down as neuro-degeneration on the death certificate.
“Because of his age, the hospital kept samples of his brain for future research. Daniel had a brain scan after he started feeling very lethargic in January 2016 and that’s when his dad’s brain samples were tested in a lab in Edinburgh and the results came back that he had Alzheimer’s and Daniel may have inherited the same gene.
“When he lost his job in the summer because he was under performing we knew something wasn’t right so he went to the doctor and in September he was told it was Alzheimer’s.”
The pair, who met 12 years ago, this week set up a Justgiving page to raise £10,000 to take their children on a trip to Disneyland Florida later this year.
Clare Walton, of Alzheimer’s Society, said: “Dementia is not a natural part of ageing and it doesn’t just affect older people.
Over 40,000 people under 65 in the UK have dementia, including people in their 30s and 40s.
“The needs of younger people with dementia are very different to those of older people and there is a shortage of age-appropriate services in the UK.
“Alzheimer’s Society is currently funding research which we hope will improve diagnosis and support for people with younger onset dementia.”