100% agree. Funny, isn't it, how on Mumsnet there seems to be multiple dozens of posters on these type of threads that have had babies in their 40s. (At least two babies.) And they know of at least a dozen people who had two or three babies after the age of 42, even a few at 50+. 
And yet in real life, nobody that I know had baby at 49/50 or older. I've known three people in my life, who had a baby after 45 (two at 45 and one at 46 actually... Literally just three people.) The vast majority of people I know have babies at less than 41/42. Most of them whilst in their 30s. (or 20s.)
And I have different circles of friends in different social classes before people come up with that stupid line ' IN MY SOCIAL CIRCLE people have 2 or 3 babies in their 40s,' or 'they don't even have their FIRST baby til their 40s...!'
In real life, in the real world, very, very few people have a baby after the age of 44-45. If you were to believe some people on here, you'd think half the women in the country start having babies at 42-43, and are still having them at 49-52!
People also come out with the line 'MANY women had babies in their late 40s and early 50s before contraception.' But we all know it was their daughter's baby in the vast VAST majority of cases. 
I also think it's strange that a thread like this pops up virtually once or twice a week on mumsnet. 