I am a fun of DATY and DFK, and the taste deteriorates with the age, so, 19 y.o. for sure. Also, I found 19 y.o. are more responsible to DATY. If SP is over 30, then it is more BJ and less DATY for me, but, again, Asians are better with BJ as they often include rimming too, so, 30+ white girls...