Mike's absolutely right in reminding us all that loving, teaching, and caring for the older members of our churches is not just an "option."  The Bible really couldn't be clearer about that (Prov. 16:31, 20:29).

I think Dr. Mohler's comments were prescriptive in a couple of ways.  First, they were prescriptive in terms of evangelism.  If you're a new pastor, you need to be giving yourself to doing evangelism and bringing new people into the church.  By God's grace, that'll include all kinds of people---young, old, different ethnicities . . . possibly even some of the church's long-time members themselves. 

Second, respect for older members does not and cannot mean waiting indefinitely for everyone to be on board with a change in the church's culture.  Sometimes you have to make changes without unanimity.  Sometimes someone has to lose a vote.  We found ourselves in that position here at Third in Louisville.  The vast majority of our older members were against the reforms we were trying to make, but we were literally in a reform-or-die situation.  So we presented the reforms, talked and pleaded for months, held a vote, and reformed the church.  The official vote was unanimous, but that's only because a good number of our older members didn't show up for the meeting---and sadly, some even left the church over it.  But three years later, we're in a lot better place than we would have been had we held up the reform waiting on unanimity.