I joined a graduate scheme at a major blue chip shortly after completing my PhD, aged 28. The age difference itself shouldn't make any difference to your peer group because there will be several who have completed Masters degrees anyway, and others who are on their second career. However, these are the positives and negatives from my own experience: Positives:More maturity than your peersGreater ability to manage your timeMore experience of quantitative and qualitative analysisMore 'worldly' experience which you can bring to the tableMaturity to choose whether to go out and drink with your pals, rather than following the herd. NegativesPhDs are not generally understood in business. There may be an expectation that your PhD will make you stand out from your peer group, even if you have not acquired any more experience than your peers in the consulting which you are doing. If you are joining a big graduate employer, your managers may have a way of managing new graduates which they apply whether you are a smart new graduate of 20 or a more seasoned PhD graduate of 27. Most lack the imagination to understand the additional qualitites you bring, even if they do not relate directly to your chosen area. Those managers with complexes about their university education may develop even more of a complex for somebody with a PhD. Don't underestimate the destructive influences of jealous and insecruity!Never, ever use the title in a work environment. Universities are hierarchies based on titles and awards; businesses are based on position and salary. Some of your colleagues will be impressed with a PhD but take your time to work our who they are. If your older age and higher level qualifications prove a long term hindrance rather than a help, get your training and then move on to a company which would value them.