If you are in a dream, or to be better explained, in a coma, how would you tell. if you have developed a dream reality in a night in which you made realistic and believable memories how could you tell them apart from reality? then how do you know you aren't dreaming now and you life now is not a dream? for you will forget when you wake up and simply not care about this discussion.
this is a relatively easy topic, I just posted it up for the sake of meaningless conversation.
people in the world are still having kids when they are 13 and people back in the old days had kids when they were older. you just tend to notice the younger people having children because it is harder for them to raise them and require more attention. there is no real set age of appropriate childbearing people just like to have set things in order so they make these "appropriates" which are not always correct to use.
The same thing would happen like in the butterfly effect. if you change one wrong right another wrong would just fill its place. you will than wish you would be able to go back and change it again...and so on and so forth.
When I die what would do I think it will be like? well first I would not be able to think because thought is something done by the body, when you die, if you are religious, you will be separate from your body and will not be able to make rational individual thought until we are united with your body again. If you are not religious, you would not think either because you would disappear in the nothing void of complete absence for what would not seem like eternity. because you can not experience.