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Related Clues:
- Very high mark
- It starts in the 60s, by most reckonings
- 100, gradewise
- Period of life associated with wisdom
- Hundreds initially fleeing icy enclosure in autumn, so to speak
- Spectacular grade
- Best possible grade
- Outsanding school grade
- Gerontology focus
- Valedictorian's grade, maybe
- 98, grade-wise
- Very high test grade
- Superlative grade earned by six answers in this puzzle
- "Ripe" time of one's life
- Excellent test result