Find out if a property is declared virtual

Sorry, I am looking up the System.Type type and the PropertyInfo type in the documentation but I can't seem to find the thing I need.

How do I tell if a property (or method or any other member) was declared virtual in its declaring class?

For e.g.

class Cat
{
    public string Name { get; set; }
    public virtual int Age { get; set; }
}

How do I tell if the Age property was declared virtual or not?