This is a little demonstration of how we can use classes.

Family

using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;

namespace DefiningClasses
{
    public class Family
    {
        private List<Person> people;

        public Family()
        {
            this.people = new List<Person>();
        }
        public void AddMember(Person person)
        {
            this.people.Add(person);
        }
        public Person GetOldestMember()
        => people.OrderByDescending(a => a.Age).FirstOrDefault();
    }
}

Person

namespace DefiningClasses
{
    using System;
    using System.Collections.Generic;
    using System.Text;    
    public class Person
    {
        private string name;
        private int age;
        // The first should take no arguments
        // The second should accept only an integer number for the age and produce a person with name & quot; No name"
        // and age equal to the passed parameter.
        // The third one should accept a string for the name and an integer for the age and should produce a person
        // with the given name and age.
        public Person()
        {
            
        }
        public Person(int age)
            :this() // Im going to call ctor that is empty
        {   
            this.Age = age;
            
        }
        public Person(string name, int age)
            :this(age)
        {
            this.Name = name;
        }

        public string Name
        {
            get { return this.name; }
            set { this.name = value; }
        }
        public int Age
        {
            get { return this.age; }
            set {
                this.age = value;
            }
        }
    }
}

StartProgramm

using System;
using System.Collections.Generic;
using System.Linq;

namespace FamilyReunion
{
    public class StartUp
    {
        public static void Main(string[] args)
        {
            Family family = new Family();

            int count = int.Parse(Console.ReadLine());

            for (int i = 0; i < count; i++)
            {
                string[] personInfo = Console.ReadLine()
                    .Split()
                    .ToArray();
                string name = personInfo[0];
                int age = int.Parse(personInfo[1]);

                Person person = new Person(name, age);
                family.AddMember(person);
            }
            Person olders = family.GetOldestMember();
            Console.WriteLine($"{olders.Name} {olders.Age}");
        }
    }
}

The programm checks how many family members are given from the user and then asks for detailed information.
Example input:
3

count of

Jordan 23
Tom 21
Philip 46
Example output:
Philip 46