John Gill Commentary 2 Kings 4:18

"And when the child was grown, it fell on a day, that he went out to his father to the reapers." — 2 Kings 4:18 (ASV)

And when the child was grown
Perhaps was six or seven years of age, or more.

it fell on a day that he went out to his father to the reapers;
it was harvest time, and the men were reaping the corn in the fields; and his father, though a wealthy man, was with them to direct them, and see that they did their business well, as Boaz formerly; and the child went out from the house to the field, to see his father and the reapers, for his recreation and diversion.