Dictionary && Lists

using System;
using System.Collections.Generic;

public static class Program{
    public static void Main(){
        Dictionary<int, Person> persons = new Dictionary<int, Person>{
            {15, new Person("Петрова Н.А.",   'Ж',  1940)},
            {22, new Person("Иваненко И.М.",  'М',  1940)},
            {23, new Person("Иваненко М.И.",  'М',  1968)},
            {24, new Person("Иваненко М.М.",  'М',  1990)},
            {32, new Person("Будай А.И.",     'Ж',  1960)},
            {33, new Person("Будай В.С.",     'Ж',  1987)},
            {35, new Person("Будай С.С.",     'М',  1965)},
            {42, new Person("Коладзе А.С.",   'Ж',  1935)},
            {43, new Person("Коладзе Л.А.",   'М',  1955)},
            {44, new Person("Родэ О.С.",      'М',  1992)},
            {46, new Person("Родэ М.О.",      'М',  2010)},
            {52, new Person("Ауэрман А.М.",   'Ж',  1995)},
            {73, new Person("Антонова М.А.",  'Ж',  1967)},
        };

        persons[22].children.Add(persons[23]);
        persons[22].children.Add(persons[23]);
        persons[42].children.Add(persons[23]);
        persons[23].children.Add(persons[24]);
        persons[73].children.Add(persons[24]);
        persons[22].children.Add(persons[32]);
        persons[42].children.Add(persons[32]);
        persons[32].children.Add(persons[33]);
        persons[35].children.Add(persons[33]);
        persons[15].children.Add(persons[35]);
        persons[32].children.Add(persons[44]);
        persons[35].children.Add(persons[44]);
        persons[23].children.Add(persons[52]);
        persons[73].children.Add(persons[52]);

        Dictionary<int, Person>.KeyCollection keys = persons.Keys;
        int ansID=-1; int minAge=1000;

        foreach(int key in keys){
            if(persons[key].gender!='Ж'){
                continue;
            }

            int minChildDOB=3000;
            for(int j=0; j<persons[key].children.Count; j++){
                if(persons[key].children[j].dateOfBirth<minChildDOB){
                    minChildDOB=persons[key].children[j].dateOfBirth;
                }
            }
            if(minChildDOB==3000){
                continue;
            }

            if(minChildDOB - persons[key].dateOfBirth < minAge ){
                minAge = minChildDOB - persons[key].dateOfBirth;
                ansID = key;
            }
        }
        Console.WriteLine( ansID==-1 ? "No" : ansID.ToString());
    }
}

public class Person{
    public string name;
    public int dateOfBirth;
    public char gender;

    public List<Person> children;

    public Person(string _name, char _gender, int _dateOfBirth){
        name=_name;
        dateOfBirth=_dateOfBirth;
        gender=_gender;
        children=new List<Person>();
    }
}