Retirement contributions hit record highs in the first three months of the year, and one unlikely generation fueled it. Gen Z – those aged 14-29 – increased its IRA contributions 65 percent year-on-year, more than double millennials’ 31 percent, according to a new retirement analysis from financial services firm Fidelity. The average worker contributed a record $2,080 to their 401(k), while IRAs saw contributions hit record highs, too, the study found. One reason why IRAs are popular, in general, is because of their flexibility, said Adam Bergman, founder of retirement firm IRA Financial. Decide: traditional vs RothThere are two types of IRAs: traditional vs. Roth.