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Age Calculation with nullable death date

using System; using System.ComponentModel;         class Person         {             DateTime birth;             DateTime? death;             string name;             public TimeSpan Age{                 get{                     if (death == null){                         return DateTime.Now - birth;                     }else{                         return death.Value - birth;                     }                 }             }             public Person(string name,DateTime birth,DateTime? death)             {                 this.birth = birth;                 this.death = death;                 this.name = name;             }             public static void Main()             {                 Person turing = new Person("A",new DateTime(1913, 2, 23),new DateTime(1954, 6, 7));                 Person knuth = new Person("D",new DateTime(1978, 1, 10),null);             }        }