He devoted his life to education.
There are few people you can call a lifelong friend.
for life; all one's life; throughout one's life
Adverbial use meaning 'for the rest of one's life' or 'throughout one's entire life'; often used with verbs like 忘れない, 続ける, 覚えている.
I will never forget this kindness for the rest of my life.
He remained single all his life.
I will never forget his kindness for as long as I live.
He devoted his entire life to research.
She staked her whole life on music.
He remained single for the rest of his life.
生涯 is a formal but still commonly used word for a lifetime, while 一期 read いちご is more archaic and mainly survives in set phrases like 一期一会.
生涯 is the common word for a person's whole life, whereas 一世 carries a more formal, literary tone for the same idea.
生涯 is a formal, literary word for 'one's life span', whereas 一代 focuses on the era or reign defined by one person's activity.
customer lifetime value; LTV
lifelong learning