My son just turned eight.
He has the vocabulary of a 10 year old, and sometimes the sense of humour of an adult!
Emotionally, though he tries to act "tough", he seems to be about five.
Socially, as in interacting with his peers (minus the vocab), he is around four. He still engages in parallel play.
He is as sensitive as a pregnant woman, and can cry very easily if frustrated or insulted. Yet sometimes he has an emotional wall up, (when he has done something wrong) that cannot be penetrated by reason or empathy. (I think he does this to protect his sensitive feelings from criticism)
In his play, his likes and dislikes, he is about four. Hot wheels, trains, airplanes. No brand name requirements or latest tv show "fads". Which I love!!
I can safely expect him to take personal care of himself at around the level of a four/five year old. That is sometimes frustrating.
Many times, he says things that are so smart, and so wise, they flabbergast me into speechlessness.
And I am rarely speechless!
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Be not angry that you cannot make others as you wish them to be, since you cannot make yourself as you wish to be.
~Thomas à Kempis
"Be plain, good son, and homely in thy drift;
Riddling confession finds but riddling shrift"
~Shakespeare