Researchers are warning that the number of pensioners with cancer will treble by 2040.
The study, funded by Macmillan Cancer Support shows that:
In three decades' time, 4.1 million over-65s will be living with the disease
That compares with 1.3 million in 2010
Nearly one in four older people will receive a cancer diagnosis in 2040
The rise in cases could be down to a number of reasons, including an ageing population, increased incidence of cancer and increasing cancer survival rates.
Macmillan Cancer Support is warning that the care of older cancer patients is the "ticking time-bomb" for society.