life: countable or uncountable noun
When we talk about life in general, or about a kind of life, life is normally uncountable.
- Life is complicated.
- Anna enjoys life.
- I think I would enjoy city life. (not
… a city life.)
When we describe particular people’s lives, life is normally countable.
- My grandmother had a hard life. (not
… had hard life.) - My mother’s parents lived interesting lives.
note
For more about countable and uncountable nouns, (see here).