Paper Mache is a recyclable material made from paper pulp already pre-mixed with glue.  Kids as young as 5 years old can do simple craft projects by overlapping the surface of an object with Paper Mache, wait for completely dry before painting with Tempera or Acrylic Paints.  Adults can use it to make any crafts or decorative piece and finish off with Acrylic Paints.  There is no limit to its shelf life.  Just make sure it is kept dried without touchiing water.