Wines and champaigne's can "go off" or become "corky" if the cork fails or becomes compromised.

Reasonably stored your champaigne will be relatively unchanged for years, decades even.

Since your bottle has no date ... it is what is referred to as NV or Non-Vintage and may actually contain wines from different years productions. These wines may be consumed immediately or stored for years ... that's up to you. It won't particularly improve or appreciate in value with age if you choose to store it..