Related Clues:
- Numerous centuries
- Apparent stretch between Christmases, to kids
- Starts acting grumpy every session like four- and five-year-olds
- Improves, as wine or cheese
- Quite a long while
- Keeps having birthday parties
- Indeterminate long time
- Listless on reflection for long period
- Long, long, long time
- Is infuriated to lose leader for a long time
- Gets more mature
- Seemingly endless span
- Hard-to-imagine period
- Near-infinite time span
- Def Leppard "Rock of ___"