Writing a fuzzy limit into law is difficult to do well, and dangerous to do poorly. A hard age limit can make annoying PR-type stories, "he was just 3 days under/over the limit!", but unless the accused is retarded it does avoid a jury being asked to decide whether the person was "adult enough", whatever that means.
__________________
_________________
|...............| We live in the nick of times.
| Len 17, Wid 3 |
|_______________| [pics]
|