THANK YOU EVERYONE!
I've just imported the data and there are some wonderful responses.
Factomum: age isn't something I need for the analysis, it was something that was put in to add to my writing. Eg. There is the potential to re-do the study from a psychological view (how does someone's age affect their willingness/ability to change opinions) or from a business/marketing view (does age affect brand loyalty). You are right, there is a lack of validity with the 50+ bracket and this will be picked up on within the analysis if age is used, if not it will be referred to in the discussion section. Anyone would have thought it were intentional...