extra subset of xml input in xslt

I need an xslt file to transform the input xml. It needs to output the employee's name when their age is over 40. Each record needs a comma at the end, and the last record needs a semi-colon.

Input

<employees>
    <employee>
        <name>Bill Jordan</name>
        <age>40</age>
    </employee>
    <employee>
        <name>Larry Bird</name>
        <age>42</age>
    </employee>
    <employee>
        <name>Joe King</name>
        <age>25</age>
    </employee>
    <employee>
        <name>John Smith</name>
        <age>45</age>
    </employee>
    <employee>
        <name>Kathy Bush</name>
        <age>31</age>
    </employee>
</employees>

Output

Bill Jordan,

Larry Bird,

John Smith;