you dont know the whole story, fool
they might have been in a hurry
they might be spelling errors they were too lazy to fix (i make spelling errors and im too laxy to fix em half the tiem so shush)
they might just have trouble spelling stuff
age does not define how smart you are, anyway
there are many very intelligent people younger than 5, and many people who are adults or teens who just have not gotten proper education
and dont correct someone if you are going to use "r" for are and "u" for you, bc technically that could be defined as a spelling error.