Zachary is a 17 year old male who appears boastful conceited and arrogant

The diagnosis should be Narcissistic Personality Disorder. It is an identity issue in which there is a long haul example of anomalous conduct portrayed by overstated sentiments of gaudiness, an unreasonable requirement for profound respect, and an absence of comprehension of others' emotions.

Carbon-14 has a half-life of 5,730 years and most igneous rock is older than that.