Is it bad to start a period early?

Sorry the question is not asked in the way, to have e proper answer. What is the age meant in the question as early? Evolution and growth of the system tor one girl to start menustration depends on many factors (individual growth, hormonal functioning, race, climate etc. etc). May be for the cold and moderately cold climate zone menstruation comes a liitle later than those girls in the tropics, sub-tropics. And that is nothing unusual.