53 Actress and 35 Actor. You'll start your own porn site.
Actress are divided into 4 group: Teen, Young, Adult and Milf
Teens are 18 to 22 (I know usually teens are teens but you know... real age in porn...)
Young are 23 to 28
Adult are 28 to 35
and Milf are 35+
Obviously each group got different kind of sites and scenarios.
Each actress got different skills and preferences and you can raise her popularity but be careful, if you make her do scene too hard for her skillz she could decide to retire from the industry.