Zero. Even if you delivered on January 2nd (while 40), after 4.5 months there would only be 7.5 months left in the year. This is not enough time to become pregnant again and to have another 4.5 month old child before you turn 41.
About half of women over 40 have fertility problems, according to the American Society for Reproductive Medicine (ASRM).
Yes.
No
Yes. They may get pregnant as long as they get periods and ovulation. At times you get advanced pregnancy in post forty years patients.
Yes.
No. It can take less than one.
Answer yes, in you ninth month they will get sensative again. Wear a really good support bra so you don't get sagging when your forty.
When one is forty weeks pregnant, the baby is basically done developing and is ready to be part of the world. The baby's internal organs should be working as well. One will experience increased pains due to pressure when one is forty weeks pregnant.
Forty in Hebrew is pronounced ארבעים - Arbaa'im. Forty has some significance in the Torah. For example, The Flood was forty days and forty nights. Moshe (Moses) was up on Har Sinai (Mt. Sinai) for forty days and forty nights. Tradition has it that a baby is not physically male or female until forty days after the women became pregnant.
Physically, most likely.
You shouldn't. If the pregnancy is healthy, let labor come on its own.
Not particualrly. I'd talk to a doctor before taking any type of medication though. The baby should be about due at forty weeks!