It depends on what you mean by a change in values. Someone might know, for instance, that when they get older they would be more inclined to be conservative, but that that's because they act for their own benefit and being conservative is more beneficial to an older person (because it's pro-wealthy and pro-family and because he'll have a family and more money then). The average man on the street would say that the older person has "changed his values to become more conservative". But he really hasn't changed his intrinsic values, he's just changed his instrumental values, because those depend on circumstances.