While no one, to the best of my knowledge, has ever said "hey, we need to get rid of all these old people in church!" I can testify that in our American, youth-ministry obsessed culture we tend to forget the importance of the older generations and what (should) mark old age: Wisdom.
Old people should be the pillars of the church, the Levites of tradition, the experienced ones who have been around the block and give advice and help the younger generations see the error of their ways. I know this is an ideal, and probably one that's not really met as often as it should be, but there must be something to it.
Also, the older folks are the ones who are most established, both financially and real-estate wise. That's the group you're gonna need if you want to build and sustain a church building and ministry. This isn't just idealism here, there's also practicality.
So I salute you, old folks, despite your odd and out-dated mode of thinking and dress, for you are the bearers of tradition! God bless!