If the owner's seal and epitaph are excavated in a tomb, it can be determined that the tomb is the real Tomb of the owner. In the Xigaoxue tomb, the seal and epitaph of Cao Cao are not excavated. 
the Xigaoxue tomb is not the real Tomb of Cao Cao.
Eighteen year olds have not faced social problems, and anyone who has not faced these problems cannot vote. Therefore, eighteen year olds cannot vote