await Task.WhenAll multiple conditional methods

GetPersonAsync.cs

// Update in Method
public static async Task<Person> GetPersonAsync()
{
    var model = new Person();

    await Task.WhenAll(
        UpdateFirstName(model),
        UpdateLastName(model),
        UpdateAge(model)
    );

    return model;
}

public static async Task UpdateFirstName(Person model) {
    if (!model.ShowFirstName) { return; }
    model.FirstName = await GetFirstNameAsync();
}
public static async Task UpdateLastName(Person model) {
    if (!model.ShowLastName) { return; }
    model.LastName = await GetLastNameAsync();
}
public static async Task UpdateAge(Person model) {
    if (!model.ShowAge) { return; }
    model.Age = await GetAgeAsync();
}