You should use “their life” when you are referring to the collective “life” that people might live. For example, if two people share a life because they are married or live in the same hous… See more

When people share a life together, we can use “their life.” Even though “their” works to talk about a group, we can use the singular noun form of “life” to show that it’s shared amongst m… See more

“Their lives” works best when we are splitting the people’s individuality specified by “their.” Remember, “their” is a plural pronoun, so we refer to multiple people. This time, … See more

It might help if you knew which of the two phrases is more common. Then, you’d have a better understanding of which one you’re more likely to come across. According t… See more