Here's something that might please those in their 50s - researchers are suggesting that 60 is the new middle age.
The claim has been made by Sergei Scherbov, the world population program deputy director at the International Institute for Applied Systems Analysis in Austria.
Dr Scherbov has been working on a study of future population projections for Europe, up to the year 2050.
The study, led by Professor Warren Sanderson, of Stony Brook University in the US, notes that if old age is fixed at a certain point, the proportion of old people will rise because of increasing life expectancy.
If the threshold for being old is moved to take into account longer lives, the proportion of old people actually falls over time.