Encuesta de Fecundidad Total Average age of females level of studies at time of marriage/No live births. Unidades: Average age ;Average age of females (years) at 1st marriage;Average age of females (years) at birth of 1st live birth;Average age of females (years) at birth of 2nd live birth;Average age of females (years) at birth of the last live birth; Total;22,6;24,22;27,36;28,3; Illiterate;18,07;20,24;22,18;28,7; Without studies;20,43;21,42;24,59;28,64; Primary education and second grade, GBE or first year of GCSE;21,95;23,31;26,86;27,77; Secondary Education and Post-secondary non-higher;23,28;25,34;28,6;28,97; 1º, 2º and intermediate technical-professional studies;22,74;24,93;27,87;27,92; Higher level technical-professional studies;24,94;27,39;31,02;28,53; First year of tertiary education;24,13;26,54;28,91;29,98; Tertiary education, university graduates and doctors;25,82;28,24;30,25;31; Notas: Fuente: