The usual pattern does seem to be for people to move a little rightward as they get older. Of course, the explanation you accept for this depends on where you are on the political spectrum. Rightwingers think this happens because people finally 'wise up' and become more realistic, jettisoning unrealistic utopian ideas; left-wingers think that people just lose their idealism and reforming energy with age.
As a
militant moderate I think that there is truth in both sides of the equation, but I lean slightly more to the right on this. While many young people are fired up by idealism, often rooted in the very best of motives, they have not always learned the life skills of tolerance and mutual respect. Therefore their left-wing views are
sometimes expressed in a shrill and hectoring manner, eager to lecture, unwilling to listen...
However, contributors who point out that the right can also be intolerant, extreme and crazy are perfectly correct. I think there is a very simple explanation for this. It has been pointed out above that the US uses the word 'liberal' in an unusual way to refer to the whole spectrum of the left, rather than to the centre and (mildly) centre-left (i.e to the 'right' of socialism) as most of the rest of us understand the word to mean. What is less often noted is that the US also uses the word 'conservative' in an unusual way. In most parts of the world, conservatives are located on the centre-right, supporting free entreprise, liberal democracy and a belief in the value and usefulness of long-standing institutions. Reading this forum, it strikes me that
some self-labelled American 'conservatives' are actually right-wing radicals, and therefore it should come as no surprise that they indulge in the same extremism, intolerance and single-mindedness as their left-wing cousins.
As to my own life trajectory, it has been a gradual evolution from the hard left to "militantly wishy-washy moderation". I think it unlikely (but not impossible) that I will move any further to the right because my present viewpoint seems best to suit my character and intellectual propensities as I have come to understand them. However, never say never!
An interesting post and a revealing question. Thank you MM.