My boys go rock fishing after school nearly everyday, they are 10 & 14.
A few things worth mentioning, I have taught them over the last few years of the dangers of rock fishing.......
4 main rules.
1. They must observe the conditions for at least 10 mins before they pick their platform.
2. They must wear a life jacket at all times, no exception.
3. They must have an exit strategy. This means if they are swept off the rocks or fall in, where are they going to swim to exit. It's not always possible to remount the platform you left.
4. As mentioned, never fish alone.
To add weight to the reason I let them go are a few factors. They are very sensible kids, they know their area well and they understand what I expect from them. And quiet often I join them 1/2 hour later!
I will also mention, they are very competent swimmers at junior life saving level.
I have also drummed into them that NO piece of equipment (rod/reel/bucket etc) or fish, is worth risking your life for. Once it's in the drink let it sink!
It certainly can be a very challenging and rewarding fishing experience. But remember that it is the most dangerous sport in the world!
Cheers scratchie!!!