The fact that genetically identical twins can have such different apparent ages suggests a younger sample would be fraught with lifestyle variable problems. Eve

The fact that genetically identical twins can have such different apparent ages suggests a younger sample would be fraught with lifestyle variable problems. Even if you could record the data perfectly, trying to control for those variables would be a logistical nightmare. I'd be interested to see deeper follow-ups with increasingly-younger samples, but the only scientific conclusion one can draw from this study is whether or not a hypothesized relationship between 'apparent' age and 'actual' age are trivially falsifiable. (apparently not) That the marketing and press over-reach is a social failing; not a fault of the study.