?Best age of child to adopt

I know everyone is different when it comes to selecting children to adopt. I will be a single older mom who has always wanted to child. I have lots to offer. My question to all of you with experience is..is there a better age when it comes to children 1-6? I am looking for the best outcome for the child not myself. Their transition to our culture, our language etc. I am brand new at this and would appreciate all replies. Thanks again.