如何更改树枝模板中的文本框大小

I want to change the text box input size in twig template and i am not able to do it.

I am trying this:

{{ form_widget(form.age, { 'size': '5' }) }}

and its not working, but this is working:

{{ form_widget(form.age, { 'id': 'myid' }) }}

According to docs you should try to use attr property

{{ form_widget(form.age, { 'attr': {'size': '5'} }) }}

Try removing the quotation marks around '5'.