My 13 year old stepson got his ears pierced last year in October (he was 12 then). I wasn't thrilled, but I was okay enough to let him do it.
Since then he has become interested in "Ear Stretching" or "Gauging". It just involves changing to a larger diameter earring every six weeks or so, so that the earlobe slowly becomes stretched out. Eventually you work up to the point where a pretty large earring or plug can fit into the lobe (an inch or more). I'm sure most of you have seen it or know about it, it's not at all uncommon now.
Again, I was hesitant, but okay with him doing this -- to a certain extent. I did some research online and found that