There is such a thing as youthful folly, though. I have changed my mind on a lot of things, and I am only 35 yet. I think some experience is good for a politician.
In most cases, yes, because I see the broader picture and have information that I did not have as a young person. But of course experience tells me that I am mostly wrong at the moment, too.
I guess at my death bed I will convert to religion... (no, I hope not).