Is emission of semen the only sign of puberty?

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A boy died and had not done Hajj; can Hajj be done on his behalf?
He fasted before he reached puberty and he forgot to make up some days. Can he make them up after reaching puberty?

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Related Answers:
When should a girl observe hijab?
What is the appropriate age to teach children sex education?
Is it possible to send someone else to do Hajj on behalf of the deceased instead of his son?
A boy died and had not done Hajj; can Hajj be done on his behalf?
He fasted before he reached puberty and he forgot to make up some days. Can he make them up after reaching puberty?

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