I have a set of knee and elbow guards as well as goggles. My 11-yo outgrew them, so they're probably too small for your older one, but should be fine for the younger. I'll have to look to see if I have anything else (maybe boots).
"I don't know what you do, but I know what I do, and I don't do that." --Uncle Doug, R.I.P.
"Without the possibility of death, adventure is not possible"--Reinhold Messner