Some positivists would ask for scientific evidence of "meaning" or "purpose" of life. Positivism is very flawed and are everywhere lately with blind followers (usually they even don't know they're following it).
But this is a philosophical question.
In philosophy field one will inevitably reach the Absurdism when trying to answer this question. Because our desires, including the purpose of life, does not come in shiny scientific packages of answers. In other words we are the only animals that desires things that doesn't grow in the trees of the material world. We are like fishes wishing for fire.
After Absurdism you have only two options: Nihilism and Existencialism.
Nihilism says life have no purpose and more: life can't have any purpose.
Existencialism says life can have purpose and it divides in two options: one says you can give any purpose you like and the other says the purpose is metaphysical and is already planned.
These two subcategories is called Atheistic Existencialism and Theistic Existencialism.
With this philosophical explanation we can label any answer in this topic.
I'm a christian existencialist. So that's my answer to the purpose of life.