It's definitely not a university professor who asked that. National philosophy and social science projects and natural science projects can be declared after retirement. Why can't they publish articles? You pay the page fee yourself or by project. Why should others care about your business? Publishing an article is like spending money on shopping or leisure in the supermarket, as long as you are happy. It's just that the article you published is of little significance. There is no scientific research task after retirement, unless the school has scientific research awards, publishing articles and getting some bonuses.