【lifetime】 —

1. the period during which a person, plant, or animal is alive:

• Bigamy—marriage with a second wife or husband during the 【lifetime】 of the first.

2. the duration of a thing or a thing’s usefulness:

• The Viking spacecraft will consist of an orbiter and a lander, each with a 【lifetime】 of many months.

3. is used to hyperbolically designate an exceedingly long time:

• I got complications, had ups and downs. I was a 【lifetime】 in that ward.

【time of life】 —a particular period in a person’s life:

• He handles it with the delight that a new mental toy inspires in most men at a certain 【time of life】 .

See also: one’s 【time of life】 / time of one’s life.