I think we first have to scope what definition of intelligence we want to compare:

1)having good understanding or a high mental capacity; quick to comprehend, as persons or animals: an intelligent student.

2)displaying or characterized by quickness of understanding, sound thought, or good judgment: an intelligent reply.

3)having the faculty of reasoning and understanding; possessing intelligence: intelligent beings in outer space.

4)Computers. pertaining to the ability to do data processing locally; smart: An intelligent terminal can edit input before transmission to a host computer.

Depending on the definition computers already beat humans, not only 4 years old.