Lifetime

wiktionary

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From Middle English liftime, equivalent to life +‎ time. Compare Saterland Frisian Lieuwendstied, Dutch leeftijd and levenstijd, German Low German Levenstied, German Lebenszeit, Danish livstid, Swedish livstid, Icelandic líftími.

etymonline

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lifetime (n.)

also life-time, "duration of one's life," early 13c., from life (n.) + time (n.). One word from 19c. Old English had lifdæg in same sense, literally "life day."