Subjective Wellbeing (SWB) can be assessed with distinct measures that have been 
hypothesized to represent different domains of SWB. The current study assessed 
SWB with four different measures in a genetically informative sample of 
adolescent twins and their siblings aged 13-28 years (N = 5,024 subjects from 
2,157 families). Multivariate genetic modeling was applied to the data to 
explore the etiology of individual differences in SWB measures and the 
association among them. Developmental trends and sex differences were examined 
for mean levels and the variance-covariance structure. Mean SWB levels were 
equal in men and women. A small negative effect of age on mean levels of SWB was 
found. Individual differences in SWB were accounted for by additive and 
non-additive genetic influences, and non-shared environment. The broad-sense 
heritabilities were estimated between 40 and 50%. The clustering of the four 
different measures (quality of life in general, satisfaction with life, quality 
of life at present, and subjective happiness) was explained by an underlying 
additive genetic factor and an underlying non-additive genetic factor. The 
effect of these latent genetic factors on the phenotypes was not moderated by 
either age or sex.