It could be illegal, but it will depend on the laws in your jurisdiction and the exact (by the day!) difference in ages. It can make a big difference if the age is more or less than three years in many places. Be careful and don't ruin both of your lives!
Nothing.
they get cheap toys that last longer
Nothing but if the pebble is raw it can have changes in size the longer it stays in a liquid.
The speed when falling objects no longer accelerates due to air resistance is the maximum falling velocity.
Usually you should just wait a little longer. If still nothing happens, then the server you are connecting to may not work.
they can no longer live in that area because there is nothing around
Well, nothing. When you're in there for a much longer period then you could suffocate.
falling longer
Nothing is longer then a Anaconda. There is also nothing longer
there leader is no longer alive he is dead
A falling object no longer accelerates, due to friction in the atmosphere, when the friction buildup equals gravity's acceleration. This is called it's terminal velocity.
When an atom becomes an ion, it is because the atom now no longer has a neutral charge. Nothing really happens besides this, unless it reacts to a different element.