Language change and variation:

Language use is dependant on many factors.

Age: Young people speak more colloquially, older people tend to use standard English and their accent tends to reflect RP more than the younger generation, the older generation like to use language 'properly' compared to the younger generation who tend to shorten words,e.g. 'ain't'.

Sexuality: Tend to use more terms on endearment, e.g - love, honey, darling. 

Gender: Women talk more, use more fillers, subject change a lot more. Men tend to use more non-standard English.

Social class: Higher class speak closer to received pronounciation-more inclined to use standard English.

Ethnicity: Ethnic background alters phrases used, dialect and pronounciation.

Deviance: Colloquial, often more lower class, non standard, code words, jargon, alternative word use - like another language to disguise what is being said. 

Occupation: Jargon, job related speech - particularly by medical professionals. 

Region: Accent & dialect.

Hobbies: Jargon.