Key points from article :
We seem to be ageing more slowly than we were two decades ago.
Biological age is lower for recent periods across all age groups.
Biggest drop (4 years) seen in men aged 60-79.
Biomarkers examined included inflammation, organ function and breath capacity.
Also blood indicators such as haemoglobin, cholesterol, creatinine and C-reactive protein.
Studied data of 21,575 under 80s in US between 1988 and 2010.
The study was published in the Demography journal.
