“Throughout one's life” in Japanese
Short answer
Throughout one's life in Japanese is “終生” (shuusei). Full meaning: all one's life, throughout one's life, as long as one lives.
Other ways to say “Throughout one's life” in Japanese
終世
shuusei all one's life, throughout one's life, as long as one lives
生涯
shougai life, lifetime, career; for life, all one's life, throughout one's life, as long as one lives
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