Look, if this issue was easy, it'd be called Your Mom*, right?
Seriously, limiting guns to women and men over 30 or otherwise worthy would leave enough guns to defend your civil rights.
And I think this limit would make it harder - not impossible, of course - to get or keep guns if you're not supposed to have them. Of course, serious well connected criminals will have guns no matter what the law says. It's the fringe nutters, the show off teens, who this will restrict.
If you were worried about slippery slopes and your civil rights, you're far too late for that with all the secret surveillance and warrantless tapping going on and such
*apologies to Sexobon's actual mum.