Dear all,
I am investigating the effect of the X policy passed in 2005 on women's employment outcomes (1 if employed in last 5 years/0 otherwise). I am using cross-sectional data collected before and after the program. pre-intervention (1995 & 2000) and post-intervention (2005 & 2016). The fact that I am observing different women in different years, years of birth is different. For example, I observe a year of birth 1977 in pre-policy (1995 2000) but no women were born in post-policy (2005 2016) so its value is zero. Is it possible to include a year of birth as a control variable? My worry is that I have just a few years of birth that is common across surveys. In general, is it possible to control for variables like that when dealing with cross-sectional data?

Thank you so much for your answers in advance!