In contrast, it has been estimated that people under 30 face inflation of 2.6 per cent.
Shona Dobbie, head of Alliance Trust research centre, said: "Our study continues to highlight the extent to which the impact of inflation can differ from the official headline figure.
"This month we have found that the over 75s are once again the most exposed to the negative impact of high food and energy costs."
According to previous research released by Alliance Trust, the elderly were also hit hardest by the rising cost of food and energy in February.
Click here to run an energy price comparison, and see if you could be paying less for your gas and electricity.