This isn't very definitive, but if you're “old” you'll appreciate it:
It appears that 20-somethings are more efficient at identifying the most rewarding choices, but slower to form hypotheses about the dynamic relationships between past and future choices. The latter form of problem solving, the scientists emphasize, is much closer to the dilemmas faced in real life. Aging may bring some cognitive declines, but it may also lead to the insight and wisdom needed for the best decisions.
Wray Herbert’s book, On Second Thought, is out in paperback and on my reading pile.