My SIL is a bit like this.
She is 36 yrs old. But she puts on a cute little girl act.
My brother enjoys it, it makes him feel big and strong.
They have quite a traditional relationship - he goes to work, she is SAHM. He does the manly DIY and car maintenance, she does all the housework.
It works for them.
And I do like her and get along with her just fine.
But the cutesy little girl behaviour gets up my nose sometimes.
However what is interesting is that she also displays the other side of a '1950s housewife' when she is displeased.
She then gets cross in a passive aggressive way [commences noisy dishwashing and vacuuming for example] and repeatedly makes her point hoping to get her way [or nags really].
And DB doesn't enjoy this nearly so much, no sirree 
She usually gets what she wants though, so good for her.
Just not my way of doing things. I would prefer to talk to DH and be spoken to as an equal. And if I want something done I do it myself [or suggest to DH that it would be a good idea, never nag, oh no ].
That said I am not always successful so maybe there is something in the surrendered wife approach...!