in the strictest sense you are an adult at 44. you are a young adult at 25, and having the liberty to act as an adult at 18 is a facility which the "State" used in the Great War to assure themselves of the slaughter of millions more, where a whole generation was lost, and so too this sensibility about living.
regretfully, i have known many children, as young as 5 years old who were exploited for sex, even they exist as a population, among the homeless (the missing), in any large city. and i have had to watch children at their games unseen, to learn they know what is, and what is wrong and what is right. a young adult today really is a reflection of their parent's(') care, otherwise as individuals they can have no childhood, and in social-exchange they have no guidance, so as Individuals they are independant without this caring, and in fraternity they do find others who are "like" them their age. the bedroom is no one's business, consent is always necessary, but do we want to live in a society where a child must consider the natural consequence of their sexuality as an unlucky occurance (condoms for twelve year olds?).
as a society we live anonomously (in the urban centres), and its a tragedy that a 15 yrold pushing a tram, as a mother, would be of no consequence to the fabric of our values for the welfare of families, (as families,) as a Heritance. However, if consent is fifteen or twelve, the State must take the welfare of the child as its responsibility which seems to be its aim, (either to abandon them at some "legal" age where they will care for themselves, or) perhaps in the future honoured, as a parent, which they will want to serve ... scary stuff huh?
by having the expectation that the State will solve our problems for us, we pay taxes, and as equals we are identified individually. yet we must take care of ourselves as persons to have an identity where we can add to a wealth, which has an exclusivity as "ours" that prospers.