Table:
text: 2007 Rugby World Cup squads
Pool C
Portugal
Player Position_ Date_of_Birth_Age Caps Club_province
Diogo Gama Centre 15 July 1981 10 Benfica
Miguel Portela Centre 4 March 1974 53 Direito
Frederico Sousa Centre 18 August 1978 38 Direito
António Aguilar Wing 6 July 1978 47 Direito
Pedro Carvalho Wing 29 June 1984 21 Direito
Gonçalo Foro Wing 14 April 1982 15 CDUL
David Mateus Wing 7 February 1980 15 Belenenses
Pedro Leal Fullback 28 April 1984 20 Direito

Question: How many caps among Portugal Rugby World Cup 2007 Pool C teams have a date of birth (age) of 15 July 1981?