While I very much agree that experience (including that of past mistakes, yours or otherwise) is a component of wisdom, I would say that knowledge and good judgment are also components. Otherwise, if it were purely experience/mistakes based, wisdom would offer no benefit when facing new situations... which, maybe under your conception of wisdom, a highly intangible concept, is entirely possible to be honest.

In that regard, someone's wisdom is like... how adequate a guidance does the sum of their general rule of thumb and mental shortcuts is to take decisions that don't suck.

Lots of things can have contributed to that pool of general principles a given individual has.