if Royce was 10 years old and he had a mass of 30kg. but by the time he turned 16 his mass has grown to 60kg. how much larger is the gravitational force between Royce and earth at age 16 compared to age 10

Answer 1

That force equals his weight. Since it is proportional to his mass (times g), his weight doubles during that six year interval.

g remains constant.

Answer 2

2 times larger