DVD format was introduced around September 1995
A DVD you have had for ages (lol) or one of the earliest to be made.
The old one and the new one are on DVD I have both
Depending on how old it is, you can go wrong with any DVD RW
The DVD player might be old or broken, or the disk might have a strach or food stains.
Soon
This isn't so much a function of the software as it is of the burner. Some burners make DVDs that aren't compatible with old DVD players, period.
Depends on the maufacturing date
Old Dogs opens in theaters on November 25, 2009 in the US so the DVD release date has not been set. ChaCha!
DVD (old acronym): Digital Video DiscDVD (modern acronym): Digital Versatile Disc
Unless you have an old, old DVD player, most likely you'll be just fine, since most commercial DVD's on the market are double layer disks. Give it a try. If it doesn't, then it doesn't, but I'd be willing to bet a donut that it will.
DVD-R is best to use for DVD players Aviosoft DTV can do this.
The song on the DVD's main menu of the movie Old School is called To Be Young (Is To Be Sad, Is To Be High). It is performed by Ryan Adams.