Customer Class (for Vehicle GUI)

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

namespace VehicleGUI
{
    public class Customer
    {
        //Members
        public int customerID;
        public string firstName;
        public string lastName;
        public double phoneNumber;
        public int custAge;
        public int creditScore;
        public string curVehAssigned;

        //Constructors
        public Customer()
        {
            customerID = 159256;
            firstName= "Brian";
            lastName = "Eno";
            phoneNumber = 2053335555;
            custAge=24;
            creditScore = 700;
            curVehAssigned = "Sentra";
        }

        public Customer(int newID, string newFirstName, string newLastName, double newPhoneNumber, int newCustAge, int newCreditScore, string newCurVehAssigned)
        {
            customerID = newID;
            firstName = newFirstName;
            lastName = newLastName;
            phoneNumber = newPhoneNumber;
            custAge = newCustAge;
            creditScore = newCreditScore;
            curVehAssigned = newCurVehAssigned;
        }


        //Get Set
        public int CustomerID
        {
            get { return customerID; }
            set { customerID = value; }
        }

        public string FirstName
        {
            get { return firstName; }
            set { firstName = value; }
        }

        public string LastName
        {
            get { return lastName; }
            set { lastName = value; }
        }

        public double PhoneNumber
        {
            get { return phoneNumber; }
            set { phoneNumber = value; }
        }

        public int CustAge
        {
            get { return custAge; }
            set { custAge = value; }
        }

       public int CreditScore
       {
           get {return creditScore;}
           set {creditScore = value;}
       }

        public string CurVehAssigned
        {
            get { return curVehAssigned; }
            set { curVehAssigned = value; }
        }

        public bool is_TwentyFive()
        {
            if (custAge >= 25)
                return true;

            else return false;
        }

        public bool is_validCreditScore()
        {
            if (creditScore < 650)
                return false;

            else return true;

        }

    }
}