Shifting demographics are reshaping complexes built for older Americans, who are looking for a variety of rates and services.</EM></P> <P>The pandemic crushed the senior housing market, cutting occupancy rates and stalling construction. Now, as the market begins an uneven rebound, developers are adapting to the coming wave of aging baby boomers with a new crop of living developments.</P> <P>Specialized housing for older Americans has been around for decades. But shifting demographics are forcing the industry to diversify more rapidly across rates and services, yielding increasingly lavish residences for upper-income Americans as well as a growing number of affordable housing models