Unless this one works differently than the one I read about a month or so ago, which isn’t at all clear from this article, no, probably not something we can get as kids.
The reason is that, at least at the moment, you need a sample of the cancer itself and protein markers for each individual, and each cancer type, so it’s a vaccine that you get only after you get the cancer. Plus it’s multiple doses over the course of several weeks.
They also aren’t sure if the cancer will come back after being eradicated, so for now they have no idea how effective it will be, nor how long it’ll last.
But this is a technology very much in its infancy. The first trial ever was earlier this year, so… who knows where it’ll go from there. Maybe they will be able to isolate enough common markers for enough cancers to have a childhood vax for prevention. Almost certainly a long ways off tho.