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Decade of this puzzle's theme song, 7 letters
Roosevelt-Truman decade, 7 letters
The decade from 1940 to 1949, 7 letters
The time of life between 40 and 50, 7 letters
Like ruby anniversaries, numerically, 8 letters
Position 40 in a countable series of things, 8 letters
Dreaded realization to a 39-year-old?, 14 letters
Middle-age birthdays, 9 letters
Fraction of it is mistaken for reinforcements (14), 14 letters
Enriches with vitamins, 9 letters
Make stronger, as a building, 7 letters
Observation, part 2, 11 letters
Aqua ___ (nitric acid), 6 letters
Banging, to Beethoven?, 10 letters
Like the ends of some crescendos, 10 letters
(music) with great loudness, 10 letters
Courage through adversity, 9 letters
Strength of mind that enables one to endure adversity with courage, 9 letters