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Phrase(s): The first hundred years are the hardest.
Prov. The first hundred years of your life are the hardest, and after that, you can expect things to get easier; in other words, your whole life will probably be difficult. (A jocular, ironic way to console someone who is having difficulties.) • Don’t worry; things are bound to improve for you. The first hundred years are the hardest.
McGrawhill's American Idioms And Phrasal Verbs