Derivation
variable: recbirest [decade estimate of most recent birth] (table[s]: tb_tbxto2007, tbold_part1/2, tb_tboto2007, tbold_control)
variable: recbirmm [most recent birth month] (table[s]: tb_tbxto2007, tbold_part1/2, tb_tboto2007, tbold_control)
variable: recbiryear [most recent birth year] (table[s]: tb_tbxto2007, tbold_part1/2, tb_tboto2007, tbold_control)
recode recbirmm 0=.
replace recbiryear=1895 if recbirest==1
replace recbiryear=1905 if recbirest==2
replace recbiryear=1915 if recbirest==3
replace recbiryear=1925 if recbirest==4
replace recbiryear=1935 if recbirest==5
replace recbiryear=1945 if recbirest==6
replace recbiryear=1955 if recbirest==7
replace recbiryear=1965 if recbirest==8
replace recbiryear=1975 if recbirest==9
replace recbiryear=1985 if recbirest==10
replace recbiryear=1995 if recbirest==11
replace recbiryear=1895 if recbirest==12
replace recbiryear=1907 if recbirest==13
replace recbiryear=1924 if recbirest==14
replace recbiryear=1940 if recbirest==15
replace recbiryear=1951 if recbirest==16
replace recbiryear=1960 if recbirest==17
replace recbiryear=1970 if recbirest==18
recode recbiryear 9999=. 0=.
gen recbirdate=mdy(recbirmm,15,recbiryear) if recbirmm~=. & recbiryear~=.
replace recbirdate=mdy(6,15,recbiryear) if recbirmm==. & recbiryear~=.
