Japanse Honorifics

The Japanese language uses a broad array of honorific suffixes for addressing or referring to people, for example -san, as in Aman-san. These honorifics are often gender-neutral, but some imply a more feminine context (such as "-chan") while others imply a more masculine one (such as "-kun"). These honorifics are used as suffixes that attach to the end of people's names, and can be applied to either the first or last name depending on which is given. In situations where both the first and last names are spoken, the suffix is attached to whichever comes last in the word order. While these honorifics are solely used on proper nouns, these suffixes can turn common nouns into proper nouns when attached to the end of them. This can be seen on words such as "猫ちゃん" or "neko-chan" which turns the common noun "neko" or "cat" into a proper noun which would refer solely to that particular cat, while adding the honorific "-chan" to mean "cute" or "small". These honorifics are often used in conjunction to Japanese honorific speech, such as Keigo, which can be found in the conjugation of verbs. － Wikipedia

San
San is referred to a title of respect typically used for any age.