What percentage of men in midlife did Daniel Levinson (1978) find had feelings of meaninglessness, turmoil, and confusion; dissatisfaction and disappointment with work and family life; and fear of aging and death?

75%

Explanation:

Daniel J. Levinson was an American Psychologist born on May 28, 1920 in New York. Levinson is one of the main founders of the field of positive adult development. Based on Levinson's work he has found out that roughly 75% of men in their midlife have had these kinds of feelings of meaningless turmoil in their lives.

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