Código PHP:
Ver originalEdad*: <select name="edadUsuario" size="1"> <br>
<option value="18">18</option>
<option value="19">19</option>
<option value="20">20</option>
<option value="21">21</option>
<option value="22">22</option>
<option value="23">23</option>
<option value="24">24</option>
<option value="25">25</option>
<option value="26">26</option>
<option value="27">27</option>
<option value="28">28</option>
<option value="29">29</option>
<option value="30">30</option>
<option value="31">31</option>
<option value="32">32</option>
<option value="33">33</option>
<option value="34">34</option>
<option value="35">35</option>
<option value="36">36</option>
<option value="37">37</option>
<option value="38">38</option>
<option value="39">39</option>
<option value="40">40</option>
<option value="41">41</option>
<option value="42">42</option>
<option value="43">43</option>
<option value="44">44</option>
<option value="45">45</option>
<option value="46">46</option>
<option value="47">47</option>
<option value="48">48</option>
<option value="49">49</option>
<option value="50">50</option>
<option value="51">51</option>
<option value="52">52</option>
<option value="53">53</option>
<option value="54">54</option>
<option value="55">55</option>
<option value="56">56</option>
<option value="57">57</option>
<option value="58">58</option>
<option value="59">59</option>
<option value="60">60</option>
<option value="61">61</option>
<option value="62">62</option>
<option value="63">63</option>
<option value="64">64</option>
<option value="65">65</option>
<option value="66">66</option>
<option value="67">67</option> </select> <br>
Te recomiendo que cuando vayas a poner tantos números, si son correlativos, hagas uso de bucles, escribes mucho menos código y queda más limpio.
Todo eso se resume a esto:
Código PHP:
Ver original<form>
<select>
<?php
for($i=18; $i<=67; $i++)
echo "<option value='$i'>$i</option>";
?>
</select>
</form>