That argument about older employees keeping jobs away from younger people looking for jobs is a false dilemma (logical fallacy) - suggesting that older employees are taking from other unknown employees when in fact it appears that keeping older people in the work force longer is one way to help counter the problems of a lower birth rate (bringing new younger employees along) and keeping them pulling their own weight longer as far as paying into social services pools that they draw from more heavily than younger people (here in the US those are typically social security and medicare).