Ésta es una versión actualizada del Documento de Trabajo IESA-WP 02-04 (Nov. 2004)This study provides additional empirical evidence for research concerning the effects of gender and age on retrospective time judgements using data obtained from a Spanish database with more than 40,000 individual observations on time estimations. Statistical analyses were performed using the Levene F-test and the t-test of variances and means, respectively. The most important results of the study are as follows: i) differences in time estimation in relation to gender largely depend on the age groups analysed, with greater differences observed in the younger age group; and ii) although there are some differences regarding age, they are related to certain age groups, particularly the youngest age group.Pablo Brañas acknowledges financial support from DGCYT (SEJ2004-07554/ECON) and Rafael Serrano from DGCYT (SEJ2005-06099/SOC).