> It’s unlikely that age alone is driving these results. In sibships of two, older siblings on average were only about one year older than younger siblings. Tha

> It’s unlikely that age alone is driving these results. In sibships of two, older siblings on average were only about one year older than younger siblings. That can’t explain why one group reads this blog so much more often than the other. It would be interesting to investigate the relationship between the age of the respondent and the effect of birth order. For example, does birth order matter less for millennials than it does for baby boomers, or vice versa? Also would be interesting to investigate how much the age difference between siblings matter. For example, does birth order matter more if the siblings are born 1 year apart vs 10 years apart?