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Shōnen(Legal definitions)
According to Japanese law, the term “shōnen” refers to “a person from the time they enter elementary school until the time they are 18 years of age” (Child Welfare Laws (児童福祉法, Jidō Fukushi Hō?), Article 4.3), and “Any person who has not reached the age of 20 years” (Juvenile Law (少年法, Shōnen Hō?), Article 2.1). In the realm of education and culture, this is the period of compulsory education. While the term “shōnen” can refer to both young males and young females, the generally accepted term for young females is shōjo.

Hikō shōnen (非行少年, Hikō shōnen^?)

A youth who has been convicted of a crime or confessed to a crime. Other terms include hanzai shōnen, shokuhō shōnen and guhan shōnen, depending on the crime and the age of the perpetrator.

Hanzai shōnen (犯罪少年, Hanzai shōnen^?)

A youth who has committed a crime. (Juvenile Law Article 3.1.1; Juvenile Activities, Police Regulations Article 2.2)

Shokuhō shōnen (触法少年, Shokuhō shōnen^?)

A youth under the age of 14 who has committed a crime. (Juvenile Law Article 3.1.2; Juvenile Activities, Police Regulations Article 2.3)

Guhan shōnen (虞犯少年 or ぐ犯少年, Guhan shōnen^?)

A youth refusing to abide by parental authority, a youth having a lawful reason for not being with their family, a youth who is naturally disposed toward criminal activity or who associates with those disposed toward criminal activity, a youth who frequents suspicious locations, a youth with a tendency to injure or assault other people, for youth with these characteristics and under these circumstances, the law can be applied to these youth. (Juvenile Law Article 3.1.3; Juvenile Activities, Police Regulations Article 2.4)

Furyōkōi shōnen (不良行為少年, Furyōkōi shōnen^?)

A youth that doesn’t fall under the descriptions under hikō shōnen (above), but who is found drinking alcohol, smoking, being out late at night, or participating in other activities that might harm their moral character; basically youth that are being generally delinquent. (Juvenile Activities, Police Regulations Article 2.6)

Higai shōnen (被害少年, Higai shōnen^?)

A youth who has committed crimes due to having had a difficult upbringing. (Juvenile Activities, Police Regulations Article 2.7)

Yohogo shōnen (要保護少年, Yohogo shōnen^?)

A youth who has been the victim of child abuse, in cases where there is no guardianship or guardianship has been deemed necessary for the youth’s welfare, and where the youth doesn’t fall under hikō shōnen (above). (Juvenile Activities, Police Regulations Article 2.8)

Source: http://en.wikipedia.org/wiki/Sh%C5%8Dnen

Shōjo(Legal definitions)
Shōjo, shojo or shoujo (少女, shōjo^?) is a Japanese word originally derived from a Chinese expression written with the same characters. The Chinese characters (少 and 女) literally mean young/little/few and woman respectively. In Japanese, these kanji refer specifically to a young woman approximately 7-18 years old. Shōjo can often be translated with the English word girl.

The kanji compound 少女 can also be pronounced otome, although otome (meaning “maiden”) is more commonly written with the kanji 乙女.

Like most kanji compounds, the term shōjo is borrowed from Classical Chinese characters, probably via Korea. The term 少女 is pronounced shao nu in Mandarin (pinyin romanization), so nyŏ in Korean (McCune-Reischauer romanization), and shōjo in Japanese (Hepburn romanization), although, as noted above, it can also be pronounced otome in Japanese.

The earliest surviving written record of the term 少女 is on the Book of the Later Han, published in China in the 5th century, in Chapter 86, The myth of Yao, referring to young girls.

In the 7th century, the word was introduced into the Japanese language through the adoption of the Chinese-style Ritsuryō legal system, where it referred to females between the ages of 17 and 20.

Source: http://en.wikipedia.org/wiki/Shoujo

Shoujo manga (also known as Shojo manga) primarily target girls. It is the female equivalent of Shonen. The story often centers around romance and love and is closely tied to the Romance and Drama genres.

Shounen manga (also known as Shonen manga) primarily target boys. It is the male equivalent of Shoujo. The story often centers around fighting and action and is closely tied to the Action, Adventure and Martial Arts genres.

Source: http://www.onemanga.com/directory/shounen/

Ecchi (or Etchi, from the Japanese エッチ etchi) is derived from a Japanese word meaning “lewd”, “sexy”, “lascivious”, or “naughty” when used as an adjective, and can refer to sexual intercourse when used as a verb or noun.

The nuance of ecchi varies with context, but in general the word itself is comparable in nuance to the English words “naughty” or “dirty” (when used as an adjective). The prefix “H-” is sometimes used to refer to pornographic genres: H-anime, H-manga, etc.

Source: http://en.wikipedia.org/wiki/Ecchi