<form action="/" method="POST">
                          <div class="row">
                            <input type="text" placeholder="Введите имя" name="firstname" />
                          </div>
                          <div class="row">
                            <input type="text" placeholder="Введите возраст" name="age" />
                          </div>
                          <div class="row">
                            <input type="radio" name="gender" value="male" />
                            <label for="">мужской</label>
                          </div>
                          <div class="row">
                            <input type="radio" name="gender" value="female" />
                            <label for="">женский</label>
                          </div>
                          <div class="row">
                            <input type="submit" value="Отправить" />
                          </div>
                        </form>