Updos are always in style. The updo will always 'do' when you are going out for an evening on the town and want to look a little bit more glamourous.
To make them more cutting edge and less grandma-like, you can add cutting edge colour (like the bright orange in this photo) and some stylish accessories. Also you don't have to make everything neat and done up in a bun. Leave some well placed wisps of hair hanging out. Never be afraid of being creative.
Just remember that if you want to make your neck look longer then an updo will certainly bring some attention and length to any neck.