Wasn't this exact same thread up a week or two ago? oO) The first answer was even the same...
Yes they will increase if the staff member is young. Increase the mi=ost between the ages of 35 and 50.no noticable change after that.
Please dont create a thread if there is already one to cover your question.
Thats what the search bar is there for.

Finally this is off topic but read the forum rules again. One word posts will result in an infraction