Michael Halliday (born 1925) is a linguist who developed a grammar model, the systemic functional grammar, originally by studing Chinese. His work was an elaboration of the foundations laid by his British teacher J. R. Firth[?]. His seminal paper on this model was published in 1961. The model has been applied to other languages as well as Chinese. It is especially useful for describing non-Indo-European languages.
... 8.1% from 18 to 24, 29.9% from 25 to 44, 23.8% from 45 to 64, and 7.9% who are 65 years of age or older. The median age is 35 years. For every 100 females there are ...