Well, keep in mind students at UCLA at 1967 were probably among the most wealthy in the country. A lot more average people at UCLA nowadays. Of course being financially well off wouldn't be the most important thing if you were already financially well off.

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