Using sandag.org data warehouse and profile warehouse (sandag is the san diego association of governments).

Median income data from here: http://datawarehouse.sandag.org/Excel/ZIP%20codes.xls
Single family detached percentage taken from dividing “single family detached” for the zip by “total housing units” for the zip, for 1/1/2009 – data from linked pdf’s
Median age come from the pdf links.

92122
Median household income (2008): $55,889
single family detached makes up 23% of housing in zip.
median age is 38.4
http://profilewarehouse.sandag.org/profiles/est/zip92122est.pdf

92121
Median household income (2008): $67,772
single family detached makes up 36% of housing in zip.
median age is 34.3
http://profilewarehouse.sandag.org/profiles/est/zip92121est.pdf

92126
Median household income (2008): $60,953
single family detached makes up 57% of housing in zip.
median age is 36.3
http://profilewarehouse.sandag.org/profiles/est/zip92126est.pdf

92129
Median household income (2008): $82,575
single family detached makes up 70% of housing in zip.
median age is 37.1
http://profilewarehouse.sandag.org/profiles/est/zip92129est.pdf

91910
Median household income (2008): $45,022
single family detached makes up 44% of housing in zip.
median age is 33.9
http://profilewarehouse.sandag.org/profiles/est/zip91910est.pdf

91911
Median household income (2008): $41,945
single family detached makes up 45% of housing in zip.
median age is 32.4
http://profilewarehouse.sandag.org/profiles/est/zip91911est.pdf

91913
Median household income (2008): $70,690
single family detached makes up 63% of housing in zip.
median age is 32.9
http://profilewarehouse.sandag.org/profiles/est/zip91913est.pdf

91915
Median household income (2008): $73,906
single family detached makes up 72% of housing in zip.
median age is 31.0
http://profilewarehouse.sandag.org/profiles/est/zip91915est.pdf

91902
Median household income (2008): $73,738
single family detached makes up 78% of housing in zip.
median age is 32.1
http://profilewarehouse.sandag.org/profiles/est/zip91902est.pdf

And those who have median household incomes over $100k (only a few zips in San Diego county)
92130
Median household income (2008): $100,339
single family detached makes up 55% of housing in zip.
median age is 37.6
http://profilewarehouse.sandag.org/profiles/est/zip92130est.pdf

92014
Median household income (2008): $102,561
single family detached makes up 62% of housing in zip.
median age is 28.6
http://profilewarehouse.sandag.org/profiles/est/zip92014est.pdf

92091(Rancho Santa Fe west)
Median household income (2008): $103,889
single family detached makes up 38% of housing in zip.
median age is 52.4
http://profilewarehouse.sandag.org/profiles/est/zip92091est.pdf

92067 (Rancho Santa Fe)
Median household income (2008): $174,776
single family detached makes up 97% of housing in zip.
median age is 47.5
http://profilewarehouse.sandag.org/profiles/est/zip92067est.pdf