Explanation:

- The ages and relationships can be deduced from the clues:

- D is thrice the age of A.

- The age differences between C & B, G & E, and E & D are the same.

- Average ages: D and G = 16, A and E = 11, B and C = 11.

- Weight details:

- B and C have equal weight.

- A is 10 kg less than B.

- D is 4 kg heavier than E, who is 4 kg heavier than F, and F is 4 kg heavier than G.

- Age-weight ratio for A is 2:5.

- Solving these relationships, ages are figured out.

- Average age calculation of B, C, D, E, G:

- Let's say A = x, then D = 3x.

- Using the averages and age difference relation, calculate individual ages.

- Calculate: $(B+C+D+E+G)/5$.

?? After solving, the average age of B, C, D, E, and G is 13 years.