I really struggled with this prompt. Not because I doubt I have wisdom, but simply because I don't feel as though I've made a lot of decisions. On the day-to-day level, sure, but I don't feel like I can cite my wisest decision being the time I decided to have falafel for supper instead of spaghetti, or something like that.
In terms of major life decisions, the only one I really made was to probably go to law school, and I'd really rather not judge the wisdom of that until it actually has played out.
Basically, I have no answer. This one's got me stumped.