A comprehensive new study from Yale University and the University of Southern California (USC) has found that Americans seem to be aging more slowly now than they were 20 years ago.
But due to a massive range of lifestyle and genetic factors, everyone physically experiences aging at a different rate, and this is known as your biological age.
The researchers gathered health and nutrition data from over 21,500 people, calculated their biological age and compared it to their chronological age, to see how the difference might have changed between 1988 and 2010.
In that time, the difference gains between patients' biological and chronological ages seemed to be higher for older people, and for men compared to women.
The researchers say this is the first evidence of delayed aging in a national sample, and the positive results might be at least partly attributed to reductions in smoking, improvements to medicine, and healthier behaviors.