vertical-cooperative/partner_age/view/partner_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
     Copyright 2020 Coop IT Easy
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
-->
<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="partner_contact_birthdate.view_personal_information_birthdate_date"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='birthdate_date']" position='after'>
                <field name="age"
                       attrs="{'invisible':[('is_company','=',True)]}"/>
            </xpath>
        </field>
    </record>
</odoo>