Paul Atkinson, from Blyth, Northumberland, was diagnosed with prostate cancer in May 2022 and given between two and five years to live.
A lifelong Newcastle fan, his one hope was to live long enough to see his team triumph at Wembley.
"I thought when we lost there against Manchester United two years ago that was it, but we did it this time and I still feel like I'm dreaming," he said following Sunday's Carabao Cup victory.
Mr Atkinson was born in 1955, the last year Newcastle won a major trophy, and has been a season ticket holder for much of his life.