maybe from here (i.e. your link):

There have been questions about my health, and that is a factor as well. I am feeling the aches and pains that come when you reach 70. My memory fails me on occasion, but Liz would probably argue this has been going on for the last 50 years.

Or maybe from here (WaPo):
Sen. James Jeffords (I-Vt.), whose abrupt defection from the Republican Party in May 2001 handed control of the Senate to the Democrats for the next 19 months, announced yesterday that he would not seek a fourth term in 2006 due to his and his wife's health problems.

Jeffords, 70, in a surprise announcement in South Burlington, Vt., cited his own health, as well as the fact that his wife, Elizabeth, is battling cancer and will soon have to undergo another round of chemotherapy.