Related Clues:

• Timeline divisions
• Many years
• Historic periods
• A long, long time
• Very long time
• Retrospective divisions
• 10's and 20's, e.g.
• Subject of some nostalgic VH1 tributes
• Retrospective segments
• Century divisions
• Century parts
• 10-year periods
• Century sections
• They take years to end
• Periods of 10 years