class user(models.Model):
    name = models.CharField(max_length=100)
    age = models.CharField(max_length=100)

    def __str__(self):
        return self.name

<form method="post" action="url">
    <input type="text" name="user_name">
    <input type"number" name"age">
<input type="submit" value="submit">
</form>

from app.models import *
def viewname(request):
    if request.method == 'POST':
        instance_user = user()
        instance_user.name = request.POST['user_name']
        instance_user.age = request.POST['age']
        instance_user.save()
        return HttpResponse('register done')