What has happened to AT's demographics over the years? Future expectancy?

AgaBoogaBoo

Lifer
Feb 16, 2003
26,108
5
81
I'm wondering how the average age group has changed over the years and what is expected over the next many years. I'm interested in seeing if the average age gets older as members age or if they end up leaving and new (younger) ones join maintaing a certain average.

Any thoughts?