Below is an instruction that describes a task. Write a response that appropriately completes the request in French. Please answer in French.

### Instruction:
 Beckett is 12 and is three years younger than Olaf, while Shannen is two years younger than Olaf. If Jack is five more than twice as old as Shannen, what is the sum of the ages of all 4 people?


### Response:
 Olaf a 12 ans + 3 ans = <<12+3=15>>15 ans.
Shannen a 15 ans - 2 ans = <<15-2=13>>13 ans.
Jack a 5 ans + (2 * 13 ans) = <<5+2*13=31>>31 ans.
La somme de tous leurs âges est de 31 + 13 + 15 + 12 = <<31+13+15+12=71>>71 ans.