I should have looked up the
actual transcript from the beginning, because I should have known people would be lying about what he said.
No, Kavanaugh never claimed that he didn't drink while underage. Dig through the transcript yourself. You won't be able to find any such claim. It doesn't exist. Most claims seem to stem from this quote:
MITCHELL: Dr. Ford has described you as being intoxicated at a party. Did you consume alcohol during your high school years?
KAVANAUGH: Yes, we drank beer. My friends and I, the boys and girls. Yes, we drank beer. I liked beer. Still like beer. We drank beer. The drinking age, as I noted, was 18, so the seniors were legal, senior year in high school, people were legal to drink, and we — yeah, we drank beer, and I said sometimes — sometimes probably had too many beers, and sometimes other people had too many beers.
Note that he doesn't say that HE was always a legal drinker, or that he only drank after he turned 18.
For most of his highschool years, seniors who were 18 were in fact legal to drink. The law changed so that he wasn't even when he turned 18, but he never actually claimed he was. At the time Ford alleges he assaulted her, Kavanaugh was 17, so of course he wouldn't have been legal, but again, he never claimed he was. He claimed other people were. And that is true, they were.