I am planning on going to egg my elderly neighbor's home.
Why would you egg an old person's house?
I just want to get a message across to him by doing this.
Egging your neighbors home is a bad idea, particularly if your neighbor is elderly. Cleaning up after an egging is laborious, and if you're caught egging a house then you may be arrested. If you want to get a message across to your neighbor, tell them directly instead of attacking his property.
That might not work.
It is better for you to not mess with your neighbor's property. Whatever message you are trying to send is probably better just said using words. Ruining their home will only make the problem larger than it already is.