A cladogram is a stylized diagram that looks like a series of Y's or forks in a road. At each branch, or Y junction, novel characters of evolutionary origin are used to separate off one group from the rest. Cladograms can be constructed for any group of organisms.
I checked with the bubbly brain on staff, Bruce Sanderson (who reviews Champagne for Wine Spectator), and he says, Champagne can age well. High acidity and carbon dioxide act as preservatives as it ages in the bottle prior to disgorgement. After disgorgement, Champagne will develop like a still wine. If the quality is high (i.e., an excellent vintage-dated bubbly) and it is well stored, Champagne is capable of long aging.
The French, even university age students, don't engage in the excessive drinking habits of their Anglophone counterparts. That's why so many student bars in Paris are English, Australian, or American! The legal drinking age in France is 16 years for wine and beer, 18 years for spirits and liquor. Young teens drinking wine is tolerated if they're with their parents. You can buy alcohol in any supermarket, convenience store (but only untill 11pm, I think), or wine boutique.