In 1968 (Nixon vs. Humphrey vs. Wallace), with the voting age still at 21, only the very early Baby Boomers (those born before or in November 1947) could have voted at all, so the "Boomer vote" was probably too small across the board to make any conclusions.
In 1972 (Nixon vs. McGovern), with the voting age changed to 18, most Boomers voted for the first time. I haven't seen the numbers, but since Nixon won by close to 60% of the popular vote overall, I'd guess that Nixon did win a majority of Boomers, but a smaller majority than the he won among the general population.
You have to remember that in 1972 Nixon had previously been unpopular on college campuses where many of the Boomers were or recently had been. But he helped to mitigate that campus unrest problem by instituting a draft lottery as a step toward an all-volunteer military, and by moving toward "Vietnamization" of the Vietnam war.
I have the figures somewhere that a fellow FReeper had compiled. I will see if I can dig them up. Going by the numbers, Baby Boomers are a very right voting block. College protests only affected a small percentage of students back then and I find most Viet Nam vets I meet are Pro American patriots, not the filth like Kerry and what Hollywierd has portrayed. It wasn’t free love and drugs for a large percentage of them.