Django filter form appears by default as dropdown; change to checkbox

I have a model defined like below in models.py

class ImageGrab(models.Model):
    title = models.CharField(max_length=50)
    slug=models.CharField(max_length=200)
    age=models.ForeignKey(Age, on_delete=models.CASCADE)
    gender=models.ForeignKey(Gender, on_delete=models.CASCADE)
    masked=models.ForeignKey(Mask, on_delete=models.CASCADE)
    withBackpack=models.ForeignKey(Backpack, on_delete=models.CASCADE)

Filters for which are defined as below in filters.py:

class ImageFilterAge(django_filters.FilterSet):
    class Meta:
        model = ImageGrab
        fields = ['age']

###others similar to this 

class ImageFilter(django_filters.FilterSet):
    class Meta:
        model = ImageGrab
        fields = ['age', 'gender', 'masked', 'withBackpack']

The view is like below defined in views.py

def images(request):
    imagelist = ImageGrab.objects.all()
    imagefilter = ImageFilter(request.GET, queryset=imagelist)
    agefilter = ImageFilterAge(request.GET, queryset=imagelist)
    genderfilter=ImageFilterGender(request.GET, queryset=imagelist)
    maskedfilter= ImageFilterMask(request.GET, queryset=imagelist)
    backpackfilter = ImageFilterBackpack(request.GET, queryset=imagelist) 
    return render(request, 'imglist.html', {'filter': imagefilter,'agefilter': agefilter.form, 'genderfilter':genderfilter.form, 'maskfilter':maskedfilter.form, 'backpackfilter':backpackfilter.form})

My template is like this, in imglist.html

<form method="get" name="search" id="search">
     <br>
     <br>
     <br>
     <br>
</form>

This is rendered by default as dropdown select form as given in image link below. I want to change this to say checkbox multiple select and/ or radio button for the filters. Filtering Using Dropdown

How to go about doing this?

Thanks in advance.