Should WOMEN IN THEIR 30s and 40S have kids?

why is this even a question? That's the women's(and her partners) decision. The question should be 40s or 50s.... Because 30 is still pretty young.... 
My opinion, 30s ---- why not?? 30s is a perfectly normal time to have a baby. Infact 20s is to early for me, at least. 
40s? It depends...... Because when your 40 you child is more likely have a disability or there might be certain complications with the pregnancy..... But then again, that's should be between the women and her doctor.

I believe most women should have kids in their 30's and 40's when they are ready for a family mentally and financially. You see some many mothers divorcing at 30 these days. As for her still being ready physically in her 30's or 40's, I know women that have had babies in there fifties and they turned out alright.

My family and family friends, have married there high school sweethearts from ages of 15 & 16, and started having children at 18-19 year's of age, and still from today are happily married with beautiful children! These days, having a baby at such a young age, can make it or break the relationship between you and the partner! You probably want to have kids in your late 20's early 30's because having kids at your late 30's and early/late 40's your body starts to shutdown slowly, you won't have a lot of energy you did when you were in your early 20's/30's

YES!! Kate Middleton and PRINCE WILLIAM did so did Mr. & Mrs. OBAMA waited age 30s 40s & 1 of there kids is going Harvard :-) no disability there! In your 30s your getting towards financially stability or maying finishing up grad school. In your 40s your usually financially stable. Most teens and age 20s can't afford kids. Who cares what people opinion are bcuz facts are facts. JLo had twins in 40s. So did Halle Berry, Beyonce, Kelly Rowland, K & list goes on Nothing wrong with that. Most people who disagree are ones who had kids too soon and didnt fufill there career dreams to support kids financially and stuck flipping burgers or $10-$15 hour job smh.
Her youngest should be born before she's 35 in my opinion just so she can see them have a long happy life and meet their grandkids and be involved in their upbringing. If a woman has a kid at 49 she's gonna be 70 when there in college and nearly 80 before theor kids have kids of their own so they won't see their grandkids grow up. Not to mention the risk of a baby being born with Down's syndrome significantly increases. If she leaves it until her 40s she may go through the menopause and miss out on children. But that's just my opinion. A lot of women are into their careers.
Women in their 30's and 40's may not "bounce back" physically as quick as a 20 year old but generally they are financially, mentally and emotionally better off than the 20 year old. 

There are some risks in the 40's. (very similar to like under 16's) It's more the very late menopausals (very late 40's and 50's plus) that have high risks...

I'm a 17 year old and I'll just give you the most logical answer. You can have kids as long as you are ready, regardless of what age you are. Many women in their 40s actually struggle to have kids.
Only your doctor can tell you if you should try for medical reasons but you need to make that decision as to what will work for you.

Most women don't realize it but the bio clock is real. At 35 your body begins shutting down quality and quantity of remaining eggs. By 40 most women cannot get pregnant due to the ovaries but not the rest of her reproductive parts. If you are 35 and still are not ready to have kids but are not wanting to rule them out then I say freeze your eggs so at least you have them after that age. I have been involved with egg donation, surrogacy, ivf, and natural pregnancies. No longer are women needing to have kids early due to short life spans. We live much, much longer than before (35-40% more than 50 years ago)! Healthcare and screenings can keep you healthy through many pregnancies issues much easier now too.

I personally think women in their mid 30's-mid 40's are the best moms because they have had chances to get educations, good jobs, have more patience & life experiences, and they are in positions to be able to give more opportunities to their children. I am 39 and I have given birth to 6 babies (3 for friends), and I parent 3... hopefully soon 4. I have kids almost ready to leave home and one I am planning for (fingers crossed). At any age, there are their own challenges (young; no money & may resent being tied down before experiencing more & freedom... older; may need coffee in the morning but as a trade off you now don't need as much sleep as you once did & your appreciate the little things more).

Ask yourself if:
You are financially prepared
Do you plan to parent alone or with someone (spouse maybe)
What if you break up? What agreement would you have?
Have you done all the things you couldn't if you had a small child (cuz once you're pregnant & have him/her life is gonna change. You need to accommodate travel, date nights, baby proof, etc.)
Are you ready to be a 24/7 babysitter, mentor, nurse, & give the baby's needs priority over your own & your wants?
Can you take on all responsibility, and able to unconditionally love?
If you were to find out your are expecting tomorrow, would you be thrilled or freaked out trying to get out of it? Listen to your gut, don't ask strangers online or even your relatives. They aren't gonna raise it for you.
There's pros and cons to having kids at any age. Obviously the cons are that children born to older mothers are more likely to have defects, but it's not those born to like younger mothers are immune to this (my aunt had two kids with Down syndrome at ages 25 and 28. Meanwhile my own mom gave birth to triplets at age 37 and we're all completely healthy and are leading very successful lives). The pros to having kids at an older age is that you're more likely to be emotionally and financially ready for it. When you're in your 20s (and teens) you still have a lot of growing up to do...