First of all you need to take care of the atmosphere to be proper for a valentines d...
Whether you are the friend, girlfriend or parent of a teenage boy, you should not assume these stereotypes will apply to the boy you know.
Furthermore, even within a single nation state or culture there can be different ages at which an individual is considered (chronologically and legally) mature enough for society to entrust them with certain privileges and responsibilities.
Such milestones include driving a vehicle, having legal sexual relations, serving in the armed forces or on a jury, purchasing and drinking alcohol, voting, entering into contracts, finishing certain levels of education, and marriage.
Within all of these perspectives, adolescence is viewed as a transitional period between childhood and adulthood, whose cultural purpose is the preparation of children for adult roles.
The end of adolescence and the beginning of adulthood varies by country and by function.