vertical-cooperative/partner_age/view/partner_view.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <record id="view_partner_from_age" model="ir.ui.view">
        <field name="name">res.partner.form.age</field>
        <field name="model">res.partner</field>
        <field name="inherit_id"
               ref="easy_my_coop.view_partner_form_easy_my_coop"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='birthdate_date']" position='after'>
                <field name="age"
                       attrs="{'invisible':[('is_company','=',True)]}"/>
            </xpath>
        </field>
    </record>

    <record id="view_partner_tree_age" model="ir.ui.view">
        <field name="name">res.partner.tree.easy_my_coop</field>
        <field name="model">res.partner</field>
        <field name="inherit_id"
               ref="easy_my_coop.view_partner_tree_easy_my_coop"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='cooperator_type']" position='after'>
                <field name="age"/>
            </xpath>
        </field>
    </record>
</odoo>