Nora is confusing, she's 18 years old as a default, but shes diminutive for a 18 year old, she act's and is treated like she is much younger.
I don't know any 18yr olds that need babysitting, help with their bath's or can't manage to feed themselves. Unless they have a special condition that would affect there maturity, 18 yr old acting like a 10yr old etc. in which case she would be considered under age. someone might want to consider rewriting that segment, so it is believable that she is of age.