Forbes mentions the dissertation research of James Bailey, PhD 2014. From the linked article:
James Bailey, an economics graduate student from Temple University, studied this phenomenon in 19- to 25-year-olds. Before 2010, insurance companies could remove young people from their parents’ health coverage once they reached 19. One of the first components of the ACA extended this deadline to age 26. With these extra years of affordable insurance, Bailey found that young people were over twice as likely to start their own businesses as before.