The survey conducted for BMO Nesbitt Burns found that 55 per cent of those recently polled in this age group say they're currently looking after children, parents, in-laws or other relatives.
About one-third of the 800 people who responded to the Pollara online poll said they are caring for a senior.
Thirty-nine per cent said they worry that the demands of a being a caregiver will have a negative impact on their financial goals, such as saving for retirement.
"There's a sense among those in the sandwich generation that they're getting squeezed and are being forced to balance a plethora of financial priorities, from paying down their mortgage to saving for their child's education to saving for retirement," Sylvain Brisebois, regional manager at BMO Nesbitt Burns, said in a statement.
"The stress that comes with caring for children and aging relatives, balancing a career and generally keeping up with daily tasks can make it hard to focus on the future and saving for retirement."
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Pollara conducted the poll for BMO between July 29 and 31. The polling industry's professional body, the Marketing Research and Intelligence Association, says online surveys cannot be assigned a margin of error as they are not a random sample and therefore are not necessarily representative of the whole population.