I think you stop calculating these things when you think you are mature enough to do so. Most people never pass this stage, and some people are far past this stage by the time of high school. But, it is up to the person whether or not they are up to it. In a psychological approach, this should pass this stage by the time they hit puberty or a little before.
when you listen to a song you used to listen to ages ago and you get that weird as fuck spine chilling feeling as you remember how your life was at that point in time
(Source: fluffypaws)