How could I not have addressed this, coming from that parent, myself! Not having to give it much thought, I can say confidently that those who choose to have children both early in life and later in life are the smart ones!
My sister and I are exactly ten years and one month apart, she being the eldest. Subsequently, my mother had a built-in babysitter! For that reason alone, I think she is genius! The time span between children definitely worked to her advantage in that regard.
It is a joke within our family that I really grew up having two mothers, and that holds true even today. My sister, who I also consider a great friend, is very motherly to me and acts as though she needs to take care of me and make sure I am okay. Perhaps all sisters share that, as I do essentially feel the same way for her, but she tends to act in more of a responsible-for-me fashion.
By the time my sister started having children slightly over ten years after I was born, I turned into her built-in babysitter. Now that I have children, my sister is in her forties with her own children gone, so she finds herself babysitting yet again. Wow, I never realized what a cycle it has been until now!