EMBA class is definitely going to be more interesting - you will have different professors, different experience, and a different level of classmates. Usually EMBA programs get the best "stuff" and some of these things (trips, retreats, events, smaller class size, etc may indeed command the higher price premium). I would suggest that you compare the two programs and classes based on the info school releases and try to make it apples to apples. Right now your judgement is based on an assumption that the two programs are the same, which they are not.
It is of course possible that the EMBA is priced for corporate check books, where price tag is often irrelevant since companies pay for the bulk of the bill.
The main question you should get an answer to - would you be able to attend the Part Time program or would they disqualify you based on age. Part Time programs tend to be much more flexible but still worth checking with the adcom to see if that's still an option.