No, you do not have the right to ask personal questions. Well, obviously you can, but it doesn't mean others have to surrender their privacy to assuage your nosiness. The last I remember you were fixated on a hapless construction worker, what difference does it make to you what age his Lordship is.
Try these questions on for size:
How old are you?
Do you belong to an acceptable religious order
How much money does your dad make ( Round Figures will work)
What about net worth? What's that number?
Do you have any STD's, don't leave out any brothers or sister, or the youngest as aunts and uncles.
How much do you weigh, do you bathe on a frequent basis.
How much do you think your house is worth.
The above are examples of questions that should be answered as "that's not your business" or " what on gods green earth makes you thing I will answer that.