Related Clues:
- A very long time
- Times of your life
- Millennium fractions
- They're a part of every century
- See 66-Across
- Sentence units, often
- Long periods
- What some candles represent
- 10's and 20's, e.g.
- New Day divider
- Some sentence units
- 25 B.C. and 1978, e.g.
- Subject of some nostalgic VH1 tributes
- Solar and lunar periods
- Revolutionary periods?