Question: How can people be consultants if they're straight out of uni? By (my) definition, a consultant is an expert I can go to for advice on a problem, based on their broad experience in dealing with similar problems in a variety of places/circumstances. Having done it once doesn't make you an expert, and anyway what worked there may not work in the next situation.
At a tender age, you're also unlikely to have any real life experience of operating at higher levels in business, which is where consulting value is supposed to be aimed. As for credibility ... well.
So if you see a 23, 24, 25 year old 'consultant', should you laugh, cry, scream, or run for the hills?