(i)A fund is bequeathed to A for his life and after his death to B for his life; and after B’s death to such of the sons of B as shall first attain the age of 25. A and B survive the testator. Here the son of B who shall first attain the age of 25 may be a son born after the death of the testator; such son may not attain 25 until more than 18 years have elapsed from the death of the longer liver of A and B; and the vesting of the fund may thus be delayed beyond the lifetime of A and B and the minority of the sons of B. The bequest after B’s death is void.