for the first time in one's life
Emphasizes that the speaker has never experienced something before in their entire life. Often used with past tense or experiential expressions.
I went on a trip abroad for the first time in my life.
I've never eaten such delicious food before in my life.
Standard kanji-kana mixed spelling.
Kana spelling of 初めて; common in casual writing or when avoiding kanji.
Compound of 生まれて (te-form of 生まれる 'to be born') + 初めて 'for the first time', literally 'for the first time since being born'.