I have been considering having a third child. At 43, part of me advises against it, but another side encourages me to go for it. I started having children later in life and I have young kids. I also started being conscious about my age although I am quite slim, fit, and people are often surprised to learn I am in my forties. What's your experience with having three children? Is it totally unmanageable? Would it be very selfish to have another one in my mid forties?