```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;=@11:36:53</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;= 65 years old</item_name>
            <item_key>\\i2b2_VISIT\i2b2\Visit Details\Age at visit\&gt;= 65 years old\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Visit Details \ Age at visit \ &gt;= 65 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
</ns4:query_definition>

```

I want to find all visits where the patient's age is greater than or equal to 65 years old. This query will look for encounters where the patient was at least 65 years old at the time of their visit. The query is not specific to any time period and is set to have a high accuracy scale of 100. It is not inverted and will return a total of one item, which is the age of the patient at the time of the visit.