Why are others so quick to judge a woman ttc in 40's?

I am in my early 40's. Two miscarriages. Currently ttc.

My question, I have heard many women say, "I would NEVER try to have a baby in my 40's", "At 40, you should be a grandparent", "Why do you want kids this late in life", ......etc,etc.

Im so tired of the negativity, the sour faces, and judgmental opinions that are tossed at me!

I know it can be harder to get and stay pregnant in your 40's, but seriously, why are people so quick to judge and toss opinions on this?

I personally did not even think about having a baby in my 20's, I fought cancer in my early 30's, I am ready now, in my early 40's. What is so wrong with that?!??

-My question is, to the future mamas out there ttc in their 40's, what do you say/think to judgmental comments like this?

How do you not let crush your goal of having a baby?