click field "Date Of Birth"
click string with parameters "${todayMonthShort} ${todayYear}"
// calculate today year - 20 and save as birthYear
save expression "${todayYear} - 20" as "birthYear"
click exactly saved value "birthYear"
click saved value "todayMonthShort"
pick-today-date
save string with parameters "${todayDayOfMonth} ${todayMonth} ${birthYear}" as "birthDate"