Quote Originally Posted by Win2Win View Post
Doc, it's been proven that iris scans can fail after a few years due to the changes, which is why they are not being used by the UKBA. http://www.newscientist.com/article/...ic-checks.html

It's still reliable as long as the data is updated on a regular basis.
Of course nothing stays constant - even " identical " twins become less similar by middle age ! Many cells have to divide so we can grow new skin, blood, bone and other tissues when needed. Our unique genome may be affected by errors ( mutations ) during division, which can cause disease like cancer. Even the iris and retina are susceptible. Many, if not all, human diseases are caused by a combination of genetic predisposition and environmental factors.
Each of us is not only unique but we also change with time - our cells, bodies, and minds ! Already there are tests which claim to help predict how long we will live - if we really want them - but until we do know more about ageing the key word is moderation in all things !

http://learn.genetics.utah.edu/conte...its/telomeres/

http://filipinaroses.com/showthread....y-want-to-know