Related Clues:
- Goes from 13 to adult
- Birthday after birthday after birthday
- Immeasurably long period
- Goes from 13 to 14
- They increase on Tet
- Substantial period of time
- Very long timespan
- Wildly long time
- Characteristics that rarely change in cartoons
- One billion years, officially
- Extra-long time period
- Heroin used regularly for a long time
- Stretch longer than an 11-Across
- Gets better in a wine cellar, hopefully
- Phanerozoic ___ (what we live in)