No one bats an eyelid if a man becomes a Dad in his 50s.
Actually they do. There is this myth that 'men are allowed to do it! And no-one says anything.' But people DO still look a bit 
if a man becomes a dad of a newborn at 45-50. Why are people pretending it doesn't happen?
And yeah, women are maybe judged slightly more, because it is the woman having the baby, and putting her (middle aged) body through pregnancy and childbirth. And if the couple split, it will be the woman looking after the child on her own at a time when she should be enjoying her life and freedom.
In addition, there are much higher health risks to the mother, AND a much higher chance of there being health issues with the baby. Also you are way more tired and weary at 50-plus, and will not be able to give the same kind of energy to a child at that age. And like it or not, children will be judged by their peers at school when someone who looks like their granny is picking them up from school, and it's actually their mother!
I am shocked that there are so many posts supporting having a baby at nearly 50, and so many posts saying 'my granny is still fighting fit at 91 etc etc.' The fact is that these are the exception rather than the rule, and it is more likely that the child will be having to care for elderly and ailing parents, at only 15-25 when they should be enjoying their youth. Or they will become orphan at a young age (less than 25 probably, and maybe at a time when they need their parents for support, like if they have just had a baby.)
I have known 3 or 4 people in my life, whose parents had them at 44 to 46 y.o, and the parents died at a very crucial time in the child's life. When they were at college or uni, or when they were planning marriage, or had not long had their first baby, and needed parental support.
As I said before, some people may be as fit as a butchers dog at 99, and running marathons and so on, but that is not as common as people dying - or becoming infirm at 65-70-ish. All this 'yeah but you could have a baby at 25, and die in a car crash at 26' is just hyperbole. Because the fact is that you are WAY more likely to leave your child without parents when they are young if you have a baby at 50, than if you have a baby at 25!
And even if you don't die (at 70-72-ish,) you are still more likely to need care at that age than not! Right now, I know of FIVE different women who are caring for ailing parents, whilst holding down a job, and/or looking after young kids themselves. Two of these people are only in their mid 20's, because the mother had them in middle age. Every one of them is permanently knackered and stressed. Every one of them have parents who are 67 to 72. Not one is 'fighting fit' at 90.
Sure there is the odd exception, but being super fit and completely independent with no ailments or conditions or illnesses at all, past the age of 75, is quite rare. And to have a child at 50, knowing what they could be having to put up with when they are only 15-25 years old, and should be enjoying their life, and getting parental support, is just plain selfish IMO.
And don't even get me started on the health implications for a baby born to a mother who is over 45. I am actually stunned at the amount of people on here saying 'yeahhh go for it! It'll be amazing!' 'I know a woman who had a baby in her FIFTIES,' and 'my nana is still fit as a butcher's dog and totally independent at 99!'
It's not a puppy you're having; it's a baby - a human life that you will be responsible for, for at LEAST 20 years - possibly longer if there are health issues with the baby.
I am also willing to bet that most people saying this would not have a baby over the age of 45.
I am also amazed at the amount of posters who have had a baby at 48 to mid 50's, or KNOW loads of people who have. I have only known of 5 or 6 women have a baby in middle age, in my whole LIFE, and NOT ONE was over 50. Not one. They were all 43 to 46.
Apologies to the OP @spoog1971xx if you find my post negative, but some common sense and reality needs injecting into this thread, to counterbalance all of the gushing 'yay, a new baby at 50, it will all be soooo great' and unrealistic 'my nana is 91 and fitter than me at 35' type of posts...