Interesting question that the study can also answer, because it also asked about parental income!

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1966 Median Household Income = $7400 [1].

51% of students in the $0-9999 bracket

Largest chunk of students (33%) in $6k-$9999 bracket.

Percent of students from families earning at least 2x median = 23%

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2015 Median Household Income = $57k [1].

65% of students came from families earning more than $60k.

Largest chunk of students (18%) in $100k-$150k bracket.

Percent of students from families earning at least 2x median = 44%

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So I think it's fairly safe to say that the average student at UCLA today comes from a significantly wealthier family than in 1966.

[1] - https://www.census.gov/library/publications/1967/demo/p60-05...

[2] - https://fred.stlouisfed.org/series/MEHOINUSA646N