partner-contact/partner_contact_age_range/data/age_range_cron.xml

<?xml version="1.0" encoding="utf-8" ?>
<odoo>
    <record id="ir_cron_partner_age_range" model="ir.cron">
        <field name="name">Contact: Update Age Range</field>
        <field name="model_id" ref="model_res_partner" />
        <field name="state">code</field>
        <field name="code">model._cron_update_age_range_id()</field>
        <field name="user_id" ref="base.user_root" />
        <field name="interval_number">1</field>
        <field name="interval_type">days</field>
        <field name="numbercall">-1</field>
        <field name="doall" eval="False" />
    </record>
</odoo>