scientific organization

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Across
  1. 2. having lived for a long time; no longer young
  2. 7. extend over so as to partly coincide in time
  3. 8. at, into, or across the space separating
  4. 9. the position at an equal distance from the sides
  5. 11. Past tense of overlap
  6. 12. having lived or existed for the shortest time
Down
  1. 1. having lived for a long time
  2. 3. coming before all others in time or order
  3. 4. having lived or existed for only a short time younger having lived or existed for a shorter time
  4. 5. coming after all others in time or order
  5. 6. Present tense (present participle of overlap)
  6. 10. having lived for the longest time