Sergeant Alistair Slater, MM (25 July 1956 – 2 December 1984), was a British Army soldier who served in B Squadron, Air (7) Troop, 22 Special Air Service (SAS), who was killed on 2 December 1984 while on operations against the Provisional Irish Republican Army in Kesh, a village in County Fermanagh in Northern Ireland.
Sergeant Alistair Slater was 28 years old when he died
It is correct because it gives us his birth and death date and it can be calculated easily. I think the system doesn't recognize his birth date as such