The sandbox effect is much less than it used to be as there are many other more powerful metrics in the search algorithms today. However new sites do still get an initial boost. The time you are in it is not determined. 6 months is a very rough guide, again though, the effects are very minimal...
At what age, should one get married?
I would say around 24 after fun and you have experience everything life has to give, at that age is perfect to find someone to love and start a family not too young to loose anything not too old to start a family 24 definitely.
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