public interface IDisplayName { }

public class Person : IDisplayName
{
    [DisplayName("Имя")]
    public string Name { get; set; }

    [DisplayName("Фамилия")]
    public string LastName { get; set; }

    [DisplayName("Возраст")]
    public int Age { get; set; }
}

public static class DisplayNameExtensions
{
    public static string GetDisplayName<T>(this T _, Expression<Func<T, object>> propertyExpression)
        where T : IDisplayName
    {
        ...
    }
}

var person = new Person { Name = "Name", LastName = "LastName", Age = 1 };
var ageTitle = person.GetDisplayName(x => x.Age);