Her tour might be called Unstoppable, but Janet Jackson has decided to put it on hold. That’s because the pop star is pregnant just weeks before her 50th birthday, according to the celebrity news site Entertainment Tonight.

That will make hers a rare quinquagenarian pregnancy. But she’s one of a growing number of older new mothers in the United States — a trend that’s bolstered by changing societal norms and new advances in fertility treatments.

Here are three things to know about pregnancy post-50.

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1. Pregnancies after 50 are rare, but they do happen

The number of births to women of this age has jumped significantly: 743 women aged 50-54 gave birth in 2014, up from 255 in that age group a dozen years earlier, according to data from the Centers for Disease Control and Prevention. But it’s still exceptionally rare: only 1 in 10,000 births in the US are to women Jackson’s age.

There’s an overall trend toward older motherhood in the US. A growing share of these are first-time births, reflecting the fact that women, like Jackson, are waiting longer to start families.

Among celebs, Jackson is probably the most noteworthy post-50 mom, though many stars — including Geena Davis, Sophie B. Hawkins, and Halle Berry — have had children in their late 40s. But Indian villager Rajo Devi wins the prize: She was 70 when she had her first child. As Jackson herself has put it, “Dammmn, baby.”

2. It’s probably a donated egg

“It’s exceptionally rare for patients to get pregnant naturally at 50 or over 45. They make history,” said Dr. David Keefe, an obstetrician-gynecologist and fertility researcher at New York University.

In part that’s because around age 50, many women are entering menopause, after which egg harvesting isn’t possible.

And as eggs age they also accumulate more genetic glitches. The mechanism is not completely understood, but it may be because eggs have shorter telomeres, the protective caps on the ends of our chromosomes.

Once the egg’s DNA has accumulated damage it can’t repair, then its division as an embryo goes haywire, with chromosomes sticking together when they should come apart. “The resulting embryo may end up with too many or too few chromosomes,” said Dr. Kutluk Oktay, a fertility doctor and researcher at the New York Medical College. “The majority of those end up in miscarriages.”

So older would-be mothers often use eggs donated by younger, more fertile women. For younger women seeking pregnancy, donor eggs might only be discussed after they’ve tried other kinds of fertility treatments, but for those over 45, “that’s kind of where they start,” said Alicia Abdella, an infertility social worker at Massachusetts General Hospital.

3. It’s the age of the egg rather than the age of the womb

According to the Society for Assisted Reproductive Technology, “the single most important factor in predicting the success of [in vitro fertilization embryo transfer] is the age of the female partner.”

The organization has said that the likelihood of pregnancy using young donor eggs in an older mother are comparable to those of young women using their own eggs.

Still, advancing age may make gestational surrogates an attractive alternative, since older women do face increased health risks with pregnancy, including gestational diabetes, high blood pressure, and premature birth. Cost can be one of the biggest barriers to gestational surrogacy, but for people for whom money is no object, it is an option.

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  • hello,im 57 in march had tubiligation in 1983, irregular periods for years but fiance wanted a child,im very active n other say i can pass for late 30s early 40s high metabolism n healthy well preg test urine comes out positive n blood neg so no ultrasoundis given. my uterus is tilted but im bout 26 weeks now as i calculated n i hear my heartbeat n another fast one.now im really showing baby bump.i keep going to urgent cares n er they ssid he can feel top of my uterus n to make appt for pap smear n font say a word bout baby get a female dr n let her make discivery cuz everyone thinks im lying n flipped my lid. even my own mother n ex fiance n best friend dont got my bk.its sad im all alone no body by my side.i just want to cry nut no shoulder to lean on. thanks for listening.oh yeah i will hv to go into labor alone if theres a midwife or a free asst anyone id appreviaye the direction yo find me labor coach. thanks

  • Im 49, hubby is 40, im getting a tubal reversal and want to conceive on my own .. i was very fertile before tubal ligation, I still have regular normal periods.. whats your advice?

  • I am 44 ….I want to concieve.
    My boyfriend is 76.
    Can we conceive? If so what vitamins, should take too have a healthy pregnancy and child?.

    • Folic acid is the #1 thing to take before even starting hormones, to ensure you don’t have a child with spinal defects.

      Then you might need to work with a doctor to supplement your natural hormones to ensure that any pregnancy is not miscarried just due to hormones.

      Your BF should have his sperm tested for sperm count and forward motility. If his sperm aren’t able to do the job themselves, you might need to egg donate for yourself, so that one of his sperm can be injected directly into your egg. Men as young as 45 can have issues with forward motility and the ability to inseminate an egg without assistance.

      Contact your OBGYN to find out what vitamins, etc to try for the first month or so, while scheduling to have hormone testing done to both of you, to assess where you are.

      Good luck!

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