You may use descriptive analysis which can provide simple summaries about the sample, and with simple graphics analysis, they form the basis of virtually every quantitative analysis of data. Simply, descriptive analysis refers to statistically describing, aggregating, and presenting the constructs of interest or associations between these constructs. Also you may use one-way ANOVA.
It depends on what your purpose is. Do you want to relate your demographics to other variables, do you just want to describe your sample, or something else?