You have a shinogi-zukuri wakizashi. The signature is Hisamichi. Can't
tell age as there were several smiths working at various periods using
this name. I would "guess" maybe late 1600's to mid 1700's. But that
is just a guess based on style, condition and known smiths.
The tsuba is quite rusted, but I suspect it is an early one,
possibly Ko-Shoami or Katchushi.
You might find my website useful. Visual glossaries, all sorts of info
on Japanese swords. Use either mirror site that is available.
http://www.geocities.com/alchemyst/nihonto.htm
or
http://home.earthlink.net/~steinrl/nihonto.htm
If I can be of further help, just post a message.
Rich