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Unidentified fallen fifty of the Battle of Hogwarts
It is likely most of them were adults at least seventeen years old, as Harry Potter did not see anyone he recognised dead, besides those he named. It is likely that half of the fallen would have been fellow students, the rest possibly members of the Order of the Phoenix, staff members, or residents of Hogsmeade. There may well have been even more casualties than just fifty, but the bodies of these may not have been collected at that point, as Colin Creevey's body was discovered out on the school grounds by Oliver Wood and Neville Longbottom and as Hogwarts is such a large place it is unlikely that all bodies were retrieved and brought back to the Hall during that phase of the battle. In addition, we know that the Death Eaters created many explosions and fires, and some bodies were probably lost in fires or explosions, like Hedwig. Some might have also fallen into the ravines or been Transfigured. This also didn't include any Death Eaters that may have died during the battle.