diff --git a/backend/src/common/helpers/utils.ts b/backend/src/common/helpers/utils.ts
index 98bf388e..ebdc6fc9 100644
--- a/backend/src/common/helpers/utils.ts
+++ b/backend/src/common/helpers/utils.ts
@@ -1,3 +1,4 @@
+import { differenceInYears } from 'date-fns';
 import * as XLSX from 'xlsx';
 
 export function JSONStringifyError(value: Error): string {
@@ -25,3 +26,19 @@ export function jsonToExcelBuffer<T>(
 
   return XLSX.write(wb, { type: 'buffer', bookType: 'xlsx' });
 }
+
+export const isOver16FromCNP = (cnp: string): boolean => {
+  // we don't need to perform the calculation before the user has entered all the necessary digits to calculate
+  if (cnp.length !== 13) {
+    throw new Error('CNP must be 13 digits long');
+  }
+  // if first digit is above 5, then the birth year is 2000+
+  const yearPrefix = parseInt(cnp[0], 10) < 5 ? '19' : '20';
+  const year = (yearPrefix + cnp.substring(1, 3)).toString();
+  const month = cnp.substring(3, 5);
+  const day = cnp.substring(5, 7);
+  const birthday = new Date(`${year}-${month}-${day}`);
+
+  const age = differenceInYears(new Date(), birthday);
+  return age >= 16;
+};
diff --git a/backend/src/usecases/documents/new_contracts/create-document-contract.usecase.ts b/backend/src/usecases/documents/new_contracts/create-document-contract.usecase.ts
index 7699fd07..4a512815 100644
--- a/backend/src/usecases/documents/new_contracts/create-document-contract.usecase.ts
+++ b/backend/src/usecases/documents/new_contracts/create-document-contract.usecase.ts
@@ -1,4 +1,5 @@
 import { Injectable } from '@nestjs/common';
+import { isOver16FromCNP } from 'src/common/helpers/utils';
 import { IUseCaseService } from 'src/common/interfaces/use-case-service.interface';
 import { ExceptionsService } from 'src/infrastructure/exceptions/exceptions.service';
 import { DocumentContractStatus } from 'src/modules/documents/enums/contract-status.enum';
@@ -44,10 +45,7 @@ export class CreateDocumentContractUsecase implements IUseCaseService<string> {
     >,
   ): Promise<string> {
     // 1. check if the organization exists
-    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-    const organization = await this.getOrganizationUsecase.execute(
-      newContract.organizationId,
-    );
+    await this.getOrganizationUsecase.execute(newContract.organizationId);
 
     // 2. check if the volunteer exists
     const volunteer = await this.checkVolunteerExists(
@@ -68,10 +66,18 @@ export class CreateDocumentContractUsecase implements IUseCaseService<string> {
     // 6. Extract volunteerData and volunteerTutorData from the user
     const volunteerPersonalData = volunteer.user.userPersonalData;
 
-    // console.log(volunteerPersonalData);
-
     await this.validateVolunteerPersonalData(volunteerPersonalData);
-    await this.validateLegalGuardianData(volunteerPersonalData.legalGuardian);
+
+    if (!isOver16FromCNP(volunteerPersonalData.cnp)) {
+      if (!volunteerPersonalData.legalGuardian) {
+        this.exceptionsService.badRequestException({
+          message: 'Legal guardian data is required for under 16 volunteers',
+          code_error: 'LEGAL_GUARDIAN_DATA_REQUIRED',
+        });
+      }
+
+      await this.validateLegalGuardianData(volunteerPersonalData.legalGuardian);
+    }
 
     const newContractOptions: CreateDocumentContractOptions = {
       ...newContract,