Average opt-out rates rested at 4% for 22- to 29-year-old members of NEST in December last year, compared with 26% for 60- to 64-year-olds.
Speaking exclusively to PP, the provider said its records indicate that opt-out rates were 6% for 30- to 39-year-olds, and 8% among its 40- to 49-year-old members at the end of 2017.
Meanwhile, opt-out rates among members aged between 50 and 59 were 14%, compared with 23% for those aged 65 to 75.
The average rate for NEST members was around 8%, which is lower than the national average, the provider has said.
According to the government's AE review published at the end of last year, the AE opt-out rate rests at 9%, but this is expected to rise to around 22% from April 2018 to March 2019, and approximately 27% from then on, based on 'conservative assumptions'.
The master trust's director of strategy Zoe Alexander said overall, opt-out rates across age groups have remained low, meaning that millions more people are benefiting from saving into a workplace pension and preparing for retirement.
"The lowest opt-out rates have been from our youngest members. That's great to see because small, regular contributions early on in their working life can help build a large pension pot by the time they retire. Saving into a workplace pension could also mean they'll benefit from employer contributions and tax relief, getting more for their money."
NEST also calculated the savings potential for someone who would start work on 1 February 2018 at the age of 22, based on calculations which were done at the end of last month.
In this example, the ‘hypothetical member' would earn an average salary of £27,600 per annum (pa) throughout their working life; save a fixed amount of 4% every month with 1% tax relief, and receive 3% contributions from their employer.
It showed the member could generate a pension pot worth around £147,000 by the time they reach 67, of which around half would come from "investment growth alone."
A number of assumptions were used to calculate this figure, and NEST noted the actual amount the member would receive would depend on "many things that could change over time."
According to the provider, these assumptions include contributions increasing with inflation and invested in a NEST Retirement Date Fund.
Its current standard charges were applied, assuming the pot would grow at 2% to 3% above inflation, and that inflation would be at 2.5%. This did not take account of income tax which may be applied to the benefits taken.
Last week, the Pensions Policy Institute published a report looking at potential outcomes of increasing auto-enrolment contributions. It found a person who would have been 22 years old in 2017 and is assumed to earn £34,000 pa - could have £107,790 in his pot at retirement with a 2% contribution. If he contributed 8%, he could have £137,054, or £274,108 with a 16% total contribution at retirement.
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