In CA, can anybody buy ammo, or do you have to show a gun permit/license?

Don't you find it sad that you have to ask that question in a Country that has a constitutional amendment specifically written to protect your freedom to keep and bare arms.

The citizens of this country are slowly being stripped of their rights, because people are so willing to give up their freedom. It is truly sad.

You can buy rifle ammo at 18, but you must be 21 to buy pistol ammo except .22 is also has 18 for minimum age

you can buy it as long as you have ID to show your 18

as long as your 18 an older they won't say any thing