The common wisdom is that working moms are leading the push to make employers more flexible. But studies are showing it is another demographic altogether — older workers.The baby boomers are making different kind of plans in their late careers than people from earlier generations — rather than retiring, many are seeking "retirement jobs." These jobs allow them to earn money but have some flexibility in time, place or duties. This trend shows boomers expect to rely more on their own ability to support their retirement. The question now is, will employers accommodate them?So far, only 30 percent of employers offer older workers opportunities to work fewer hours, a new survey the international bank HSBC shows. Many still push older workers out the door, saying they cost more than younger workers.