If you are a woman over the age of 60, you might want to check out PersimmonTree.com. This site bills itself as an online magazine of the arts by women over sixty.
The submission process is straightforward for both writers and artists, and the site also sponsors entry-fee contests.
You can submit fiction or nonfiction, or you can try your hand at the “Short Takes” feature. According to the website, “We invite women over sixty to submit a short nonfiction piece (250-500 words) for Short Takes. Each issue will have a Short Takes column, and a second column will be added to the magazine and promoted between issues.”