The Speed of Vehicles can be measured by Km/H, the same as the drugs junkies consume can be measured by Grams/Day.
It’s Funny to notice that as we’re getting older we are more and more hiding our real age. In youth we show how old we are with the fingers on our hands, in adolescence we tell the our age without any problems and even lie about it to make us seem older, When we’re adults we “are old enough to not to play around” until we reach “middle age” crisis(without specifically tell our age to people) and then when we’re old we’re in “our 70´s,80´s 90´s” without being precise to tell people, and we’re “too old for this..” “too old for that..”