Abstract
The Subjective Well-Being Scale and its short version were developed and validated to measure life satisfaction and positive affect in a Spanish-speaking population. The aim of the present study was to obtain additional evidence of validity for the EBS-8. To this end, the scale was applied in three successive studies to a total of 2259 Mexicans aged 12 to 81 years. The results of the first study allowed us to confirm its unifactorial structure and its adequate reliability ; in the second its measurement invariance by sex, social group and age was tested. From the psychometric indices obtained, it is concluded that the EBS-8 is an excellent brief instrument constructed in Spanish to assess subjective well-being in adolescents, young people, adults and older adults.