Just a tip... I know it seems like the best idea to put the elderly up front and close to the action at your wedding reception, but be careful. Do not put them right by the DJ or band set up.
The reason you do not want to make this common mistake is that even though old people tend to not be able to hear, well, the will not react well.
Typically, for some reason, the elederly also have sensitive ears, so loud music will bother them. Ultimately, they will not like the experience and request to have the music turned down, or just leave early.
Keep this in mind when creating your seating charts and everything will turn out fine.
It's best to always put a younger table near the DJ.