Boomers for sure did, leaded gasoline began being used before Boomers were even born.

What likely leads to greater exposure is how many cars there were by the 70s and 80s. But lead exposure is cumulative over a lifetime. So I would be curious to see that research, as Boomers had roughly 40 years of exposure from 1950s to 1994. Gen X wouldn't have that much by decades.