using System.Collections.Generic;
using System.Linq.Dynamic.Core;
var youngerThanAllCoauthors = "Coauthors.All(x => x.Age > it.Age)";
var expr = DynamicExpressionParser.ParseLambda(new ParsingConfig(), typeof(Author), typeof(bool), youngerThanAllCoauthors);
public IEnumerable<Author> Coauthors { get; }