This is one of my favorite places to hang out on the internet. There’s a lot of great people from all over the world on the forum and a lot of inspiration and help for your creative writing. On the site there are plenty of places to ask specific writing questions or just hang out. Most importantly there is a ‘Writing Workshop’ where members can post and critique each other’s work. I get the impression that the average age of members tends to be in the low twenties, but despite this, there are many members with a wealth of experience and there is a consistently high level of activity across the board.
In particular I highly recommend the RPG section where we write/play collaborative stories/games. Members set up games with a setting and rules that players must follow. Players then invent characters and write from their perspective as they react and participate in the plot unfolded by the original designer. Its addictive fun that really encourages you to write and read frequently, and it encourages creativity and writing skill. Check it out!