Obama and Harris are in fact the only major party presidential nominees we've had who were born after the 1940s. Of those in the 21st century who have fallen short, Gore, Kerry, Romney, and HIllary Clinton were all born between 1943-48, and McCain in 1936 (he's also the only now-deceased major party presidential nominee this century.)
Harris has leaned much more into the generational aspect than gender or race
For good measure, Obama is the only president we have had born after 1946 and there seems to be quite the pent-up demand to move on.
Obama and Harris are in fact the only major party presidential nominees we've had who were born after the 1940s. Of those in the 21st century who have fallen short, Gore, Kerry, Romney, and HIllary Clinton were all born between 1943-48, and McCain in 1936 (he's also the only now-deceased major party presidential nominee this century.)