I'd like to find out prescription dispensing among a cohort of children between say 2000- 2005. I'd like to know the number dispensed in first 10 years. for those born in 200o, they will be aged 10 years in 2010, but for those born in 2005, they will be aged 10 in 2015. I don't not want the 2011 prescriptions for those born in 2000 to appear in this data. Anyone?