The whole study is rather useless in a social/moral aspect as it is based on what is and what isn't offensive and that is very subjective and nothing to do with science:
This means elderly people may lose their ability to censor inappropriate thoughts, making them more likely to vocalise offensive viewpoints.
For example if an elderly black person drops the N-bomb thats seen as ok within their social milieu
But if 70 year old white person drops the N-bomb...well...watch out!