From the same YouGov poll, the percentages who say gun control is either “not very important” or “not at all important, by sex, age, race, and political orientation:
The survey doesn’t ask for rank ordering of issues so there is a strong tendency for assigning high levels of importance to virtually everything (with gay rights being a notable exception) across the board. The thing worth noting is how the post-Parkland shooting narrative about kids all over the country demanding gun seizures is fabrication.
There isn’t much of a generational divide on gun rights, but to the extent that there is one, younger people are more supportive of gun rights than older people are. This holds even though younger cohorts are less white and non-whites–blacks, specifically–are modestly more gun-restrictionist than whites are. Young white men are about as pro-gun as it gets.