```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 10@19:36:32</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>4</hlevel>
            <item_name>Visit at age 100 years old</item_name>
            <item_key>\\i2b2_VISIT\i2b2\Visit Details\Age at visit\&gt;= 65 years old\100\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Visit Details \ Age at visit \ &gt;= 65 years old \ 100 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>4</hlevel>
            <item_name>Visit at age 18 years old</item_name>
            <item_key>\\i2b2_VISIT\i2b2\Visit Details\Age at visit\18-34 years old\18 years old\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Visit Details \ Age at visit \ 18-34 years old \ 18 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
</ns4:query_definition>

```

I want to find all patients who had a visit at the age of 10 years old and 18 years old, with any timing and specificity scale set to 0, and panel accuracy scale set to 100. The query will search for patients with visit details where their age at the visit is greater than or equal to 65 years old and 10 years old, as well as those with an age at visit within the range of 18-34 years old and specifically 8 years old.