For example www.hair.becomegorgeous.com/stylish_haircuts/hairstyles_for_ has a range of hairstyles and tips you could consider. Do a Google search on "hairstyles for women over 50" and you'll get plenty of results.
Remember that your hair style should suit your face shape and be something that you feel confident and happy with. Hairstyles change regularly with the latest trends so you could try and look for a 2011 hair style if you want to keep up to date with fashion.
Also, choose a hair style that fits your hair. You'll want something that looks and feels natural, and doesn't require too much maintenance.
At the end of the day, the range of choices for hairstyles is huge, so don't be overwhelmed with the different lengths, colours and volume.
Another great link for a variety of hairstyles to consider is: www.latest-hairstyles.com/short/2011.html Just keep looking until you find something you like, as there are loads of really trendy styles out there!