In my opinion the trend has been moving younger, but that doesn't mean they are young, more like middle aged. A noticeable share of introductions are from people "returning" to analog, or discovering after some time with other things. I think it is important to note that this information is merely a generalization. We have all sorts of participants. Trends have a way of being unreliable indicators, as many aren't recognized until they are in full swing. Other sorts of trends are sometimes other things than they appear. Also, the sample size here is very small, so an exogenic event, for example an instructor recommending APUG in class, can change the "trend" very discernibly.