I have known a research examine the effect of age being father and father involvement. however, in this research Cooney, Pedersen, Indelicato & Palkovitz1(993) found that being father in old ages increase fathers' involvement and while discussing about results they mentioned the career maturity. I mean they says since in older ages fathers has a stable job and they complete their career development, they involve more to their children's lives. May be you can reach and read this article:)