My stuff is always locked up.

I have a 3 and almost 5 year old that I expose to them all the time; however no free access so to speak. When my oldest turns 5 I will introduce him to a BB gun then a .22. ( as my father did with me)

I also have Foster Kids that by state regs I CANNOT expose them to it. (goofy rule) I do not let them see it and do so when they are not around or I go to my man cave (the garage).