There was a very interesting paper published in Journal of Royal Society of Medicine Vol 83 (8) 1998 pp 499 written by Newrick Affie and Corrall on the relationship between lifeline and longevity. In the summary of their research paper they state:
"The relationship between length of lifeline and age at death has been evaluated in 100 consecutive autopsies. A highly significant association between the two was discovered which was strengthened further when hand size was controlled for. We feel that a powerful new prognostic sign may thus be within grasp."
Anyone interested in the article should refer to the above paper and make their own conclusions