What about the knowledge.
Seriously, these oldies have a considerable amount of collective knowledge and IBM by getting ride of them will just lose that knowledge. Ha Ha.
I'm in a mixed team of oldies and young ones, the number of times I've seen a problem come up that completely stumps the youngsters that I've been there are got the scars from first time around.
Latest little stuff up a couple of the youngsters needed to know when records were deleted. No problem they added a table to track these. Went into production a year later this tracking table has nearly tripled the size of the database. Youngsters didn't think to add any cleanup code. It turns out that tracking data was only needed for less than a month. Doh!