The Electronic Signatures and Records Act (ESRA) provides that signatures made via electronic means will be legally binding just as hand-written signatures now are. The law also enhances and clarifies the authority of government to create and retain records in computer produced electronic form.
Shippo is the first character to join Inuyasha and Kagome in the quest to defeat Naraku and purify the Shikon no Toma. He is an adolescent fox demon or kitsune youkai as he is refereed to in the Japanese version of the anime. Although Shippo's age is never mentioned he appears approximately five years old.
The time skip for Naruto Shippuden (if we are going by the manga) is three years, which makes Naruto 16 at the start of Shippuden. Likewise, it can be argued that Naruto turned 17 at some point in Shippuden considering how long it went, but it's just conjecture.