Online spending among teenagers is up 184% compared to the same time last year, according to new data from Bank of Ireland.
Across all age groups, online debit and credit card spend was up 24% at the start of November, compared to the same time in 2020.
There was also a surge among the 18-25 age group, with online spending up 40%.
With a further increase in spending expected around Black Friday and Cyber Monday, Bank of Ireland is advising consumers to be extra vigilant and heed the warnings from their banks and service providers when shopping online.
"Not only are people at risk from things like fake websites and links to bogus offers, they are also particularly busy and distracted at this time of year," said Edel McDermott, Head of Fraud at Bank of Ireland.
She described this as a "dangerous combo", with consumers more likely to let their guard down.
"Our advice to shoppers of all ages is simple - stay safe this Black Friday and every day - be careful where you shop, watch out for suspicious texts and websites, and remember if it looks too good to be true, it is," she added.
A report by Interpol shows a surge in cybercrime is being reported around the world, with online shopping reportedly a leading factor in the steep increase in online fraud