The US Census has released a bunch of cool charts comparing data about 18- to 34-year-old San Franciscans in 1980, 1990, 2000, and now (2013). What's revealed are some fascinating figures about how likely young SF folk are to be married before the age of 35 in 1980, 63% had never been married; in 2013 that figure became 78%. We're also a better educated city than we were then, with 57% of 18- to 34-year-olds holding a bachelor's degree or higher (that figure was just 32% in 1980, and the national average right now is 22%), and not surprisingly given how expensive it it is to live here, people in this age bracket are a lot more likely to be employed than they were 35 years ago.
Also, SF was and remains way ahead of California and the rest of the country in terms of using public transit, or bicycles, to get to work.
Here are some more charts and graphs comparing SF in that period to California and the country as a whole.