Things will change.
For the past 20 years there's been a massive influx of people into IT.
Which means that we're starting to reach a point where there are ALREADY a lot of people in IT.
Those people will start becoming older and older.
It's a slow phenomenon, but I expect that by 2040 or so the average age of the IT worker to have gone up by at least 10, but more likely by 15 years.
So no more this "28 year olds are the majority", but more "40 year olds are the majority".