Juvenileness in a sentence and paraphrased in a sentence.
Here are examples of the word/phrase "juvenileness" used in a sentence and paraphrased in a sentence...
You are a senior. Leave the juvenileness for the children.
You are a senior. Leave the childishness for the kids.
She's a grown woman, but I see a lot of juvenileness within her.
She's a grown woman, but I see a lot of infantility within her.
Other Examples...