This is improper because "mature" is an adjective; an adjective can't be the subject of a sentence. It should read, "Maturity is better," or "Being mature is better."
No. This sentence is fine.
Adjectives cannot function as subjects. This sentence makes no sense as is.
Not at all. This sentence could be understood as, say, "Mature women are better.", or "Mature cheese is better.".
Than it needs to say that because "women" or "cheese" would be the subject modified by "mature." The word "mature" cannot stand alone; it needs something to modify.
It's perfectly fine, albeit colloquial.
Then it needs to be tagged colloquial.
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This sentence was initially added as a translation of sentence #337198
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