```xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns4:query_definition xmlns:ns2="http://www.i2b2.org/xsd/cell/crc/psm/1.1/" xmlns:ns4="http://www.i2b2.org/xsd/cell/crc/psm/querydefinition/1.1/" xmlns:ns3="http://www.i2b2.org/xsd/cell/crc/psm/analysisdefinition/1.1/">
    <query_name>Visit at age &gt;=@14:43:59</query_name>
    <query_timing>ANY</query_timing>
    <specificity_scale>0</specificity_scale>
    <panel>
        <panel_number>1</panel_number>
        <panel_timing>ANY</panel_timing>
        <panel_accuracy_scale>100</panel_accuracy_scale>
        <invert>0</invert>
        <total_item_occurrences>1</total_item_occurrences>
        <item>
            <hlevel>3</hlevel>
            <item_name>Visit at age &gt;= 85 years old</item_name>
            <item_key>\\i2b2_VISIT\i2b2\Visit Details\Age at visit\&gt;= 85 years old\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Visit Details \ Age at visit \ &gt;= 85 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
</ns4:query_definition>

```

I want to find patients who have had a visit at age 85 years or older, with any timing, and with a specificity scale of 0, accuracy scale of 100, and panel number 1, considering the invert flag as 0, and the total number of items in the query is 1. This query will search for the "Age at visit" field in the "Visit Details" category and return results where the age is greater than or equal to 85 years old.