Key points from article :
Levels of 1379 proteins out of 3000 change significantly with ageing.
Three big shifts in protein levels in blood happen around the ages of 34, 60 and 78 years.
May be due to a change in biological programming around these ages.
Could predict a subject's age with great accuracy.
Also ageing process may operate differently between men and women.
Could potentially lead to new diagnostic tests and new areas of anti-ageing research.
Studied 4,263 people aged between 18 and 95.
Research by Stanford University, published in the journal Nature Medicine.
