Furthermore, because people live so much longer today (even steelers, in spite of their best efforts otherwise), even with younger people continuously feeding into the ranks, the older players still around have a strong effect on the average. If the rate of entries stays constant, and people play from around age 20 until near their death in their 80s, the "average" age will be around age 50 - not so different from what we see in the surveys.
The age of people at steel shows is also not very indicative of a lack of young players. Young steelers who are working and possibly raising small children, etc. simply don't have the time and money to go to the shows like older people do - plus the kind of music played is not as appealing to younger players.
Hell, as an amateur and semi-pro, I could never even afford to buy a decent pedal steel until I was older and established in my day profession. Thank God for Mavericks and Carter Starters. The best thing about today is that you can get a great used but mechanically modern steel at an affordable price.
Let's not mourn the hypothetical death of the instrument too soon. Better to try to play and insert the steel into all kinds of today's music and look around for young guys to mentor and for new audiences.

