<table>
    <thead>
        <tr><th>First Name</th></tr>
<tr><th>Last Name</th></tr>
<tr><th>Age</th></tr>
</thead>
<tbody>
    <tr><th><button data-fname='t' data-lname='Adams' age='26'>Get Tyler</button></th></tr>
    <tr><th><button data-fname='K' data-lname='Cooper' age='26'>Get K</button></th></tr>
    <tr><th><button data-fname='M' data-lname='Conway' age='26'>Get M Ann</button></th></tr>
</tbody>
</table>

var person = $("[data-fname='t']")[0]; //or eq(0)