The British Cycling Cyclocross age categories for the 2024/25 season are as follows (effective from 1st Sept 2024):

Under 8 born in 2017 or later
Under 10 born in 2015 or 2016
Under 12 born in 2013 or 2014

Youth – born 2009 to 2012
Youth – Under 16 – born 2009 or 2010
Youth – Under 14 born 2011 or 2012

Junior – born 2007 or 2008

Under 23 – born 2003 to 2006

Senior born – 2002 or earlier

Vet 40+ born between 1984 and 1975
Vet 40-49 born 1975 to 1984
Vet 40 born 1980 to 1984
Vet 45 born 1975 to 1979

Veteran 50+ born 1974-1965
Vet 50 born 1970 to 1974
Vet 55 born 1965 to 1969

Vet 60 born 1964 or before
Vet 65 born 1955 to 1959

Vet 70+ born 1954 or earlier