I am considering to have another child. However, I think I am too old to have (I am late 30s). What is the age range that I should stop considering getting pregnant?

Ideal age according to studies is before 30 and the latest is 33 to ensure a healthy baby and easy conception. My mother-in-law gave birth to my wife at the age of 42. The thing is, she didn't experience breastfeeding my wife even for few days but thank God my wife is normal.