Java like "static" builder pattern for c#

person.cs

    public class Person
    {
        public string Name { get; private set; }
        public int Age { get; private set; }

        private Person(Builder builder)
        {
            Name = builder.name;
            Age = builder.age;
        }

        public sealed class Builder
        {
            internal string name;
            internal int age;

            public Builder Name(string name)
            {
                this.name = name;
                return this;
            }

            public Builder Age(int age)
            {
                this.age = age;
                return this;
            }

            public Person build()
            {
                return new Person(this);
            }
        }

    }