I believe the term "flourish" refers to the time of his activity as a composer, not his life time. French Wikipedia http://fr.wikipedia.org/wiki/Charles_Doll%C3%A9 says he was born in 1710 but also admits that not much is known about him.
I also found the dates 1699-1782 here, which I've put on the composer page. If, however, dates could not have been found, you can make the category display 'fl.', 'ca.', etc. by changing the text |Born Year= (etc.) to |Birth Date=fl. (etc.).