I need the codes PHP to form Consulting [on hold]

I have the form of counseling and those who need help me in writing codes PHP own form

<form action="mail.php" method="post">
                    <p>name:</p>    
                    <input class="input" name="name" size="40" type="text" required="required" />
                    <p>age:</p>    
                    <input class="input" name="age" size="40" type="text" />
                    <p>city:</p>    
                    <input class="input" name="city" size="40" type="text" />
                    <p> Email: </p>    
                    <input class="input" name="mailto" size='40' type="text" required="required"/>
                    <p>Counseling title:</p>    
                    <input class="input" name="title" size="40" type="text" />
                    <p>The subject of consultation: </p>    
                    <textarea class="input" name="message"  cols="50" rows="10" required="required"></textarea>
                    <input id="submit" type="submit" name="sendmail" value='send'/>
                </form>