Is it regarded immoral to marry young girl in Islam given that prophet Muhammad married Aisha when she was 6-7 and had her consummated when she was around 10? Generally, is everything Muhammad did considered as desirable, expected and/or good behavior for Muslims nowadays?

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Is it regarded as immoral to marry a young girl in Islam given that prophet Muhammad married Aisha when she was 6-7 and had her consummated when she was around 10? Generally, is everything Muhammad did considered as desirable, expected and/or good behavior for Muslims nowadays?