Did children fight in the gladiatorial games?

In the army, they were comonly used as drummer boys. Thus a higher chance of dying, since they were marching toward the front.

A common meme in books about that time is that young boys from orphanages were ‘sold’ to army recruiting officers for drummer boys, through bribes paid to the orphanage master.

True. But there were a few celebrated exceptions, incl. John Clem: John Clem - Wikipedia