Google has made it difficult for old websites to rank better than newer ones. There are many reasons to list, however it is a fact that having an outdated website will cause poor search engine rankings.
Flash used to be a fancy way of promoting website content, however those days are gone since mobile devices no longer support flash. Visitors are now greeted by "This plugin is not supported". Update today!
Outdated content is just as bad as having an outdated website. Search engines love current, original and mobile friendly content and they will always give updated websites a better shot at making it to the top.
Older website have a certain look and feel while newer ones follow trends, perform much better and provide a much better user experience. Bring your website to the 21st century and get better results by updating it.