Simplify the following text for a Grade 6 native English-speaking person.
Original: At the time , the world population stood at 5.5 billion , and optimistic scenarios predicted a peak of 7.8 billion by 2050 , a number that current estimates show will be reached around 2030 .
Simplified: At the time , the world population stood at 5.5 billion , and low-bound scenarios predicted a peak of 7.8 billion by 2050 , a number that current estimates show will be reached around 2022 .