There’s no age limit on protests in my mind. I’m thirteen as well and have organized a few protests in my area. Just like @briellovesaj said, make sure it’s in a safe area and be with an adult. Tip:try to make your local news stations aware of your protests because then many people will get your message.
Your never to young to organize a protest as long as you know what your doing,parent approval, make sure its in a safe place preferably along main roads in my opinion, & bring some buddies so you have fun with it!
Remember to keep a good attitude bc ppl dont always agree with our choices & can be VERY disrespectful.