(A) The proportion of all trials in which participants (n = 122) chose the left, more novel, and more uncertain choice option as a function of the expected value difference between the options. Participants were more likely to choose options with greater expected value, higher novelty, and lower uncertainty (ps < 0.001). The influence of novelty did not vary across age, whereas uncertainty was more aversive in older participants (p < 0.001). Points indicate age group means and error bars show standard errors. (B) The proportion of similar-expected-value trials (difference between the two options <0.05) in which participants chose the more novel and more uncertain option, plotted as a function of continuous age. The lines show the best-fitting linear regression lines and the shaded regions around them represent 95% confidence intervals.