I'm in physics. I hit an h (as computed by inSpire) of 16 while I was still a postdoc, and I was running low compared to my colleagues in the same sub-field (experimental particle physics) whose careers were going ahead faster than mine. On the other hand, most of my theory colleagues at a similar place in their careers were far behind me in h.
Lessons: (A) It might have meaning in comparing two people in essentially the same sub-discipline, but you simply can't make comparisons across narrowly constructed field boundaries. (B) The wikipedianumbers in the Wikipedia article was written by someone who hasn't lookare too tightly constrained and not broadly enoughapplicable.
If you insist on using bibliometrics to compare candidates you need to rate each one in terms of their progress relative their peers as closely defined as possible. That is a lot of work, so it is not for lazy people.