Large family ... what age would you stop?

Does anyone else want a large family? I already have 3 boys they are 9, 7 and 18 months. I want 6 children. However I'm 28 now and don't want to get too old having my last baby. How old do you think too old is? I'm thinking 35 would be too old for me so my next 3 babys would need to be pretty close in age. People think im mad but I have alot of love to give and my boys are well good after well mannerd boys (most of the time) both me and my partner work I work part time and he's full time so financially we would be okay so I don't see why I shouldn't have as many kids as me and my partner want. I only grew up with one brother who was 5 years younger than me and it was so boring. I love seeing the bond all my boys have. My mum even says she regrets not having more but she had her tubes tied really young. I definitely don't want to grow old with regret that I didn't have the children I wanted but then I also don't want to be really old and not be able to enjoy my baby's like I would now.