The Obama administration is likely to tackle modest Medicare cuts next year with the help of congressional Democrats while putting off consideration of changes in the Social Security program, experts said. The twin entitlement programs for older Americans face soaring expenses that could bankrupt the programs in the decades ahead. The first wave of baby boomers reaches normal retirement age in 2011. Medicare faces insolvency by 2019, based on current projections. Medicare spending has nearly doubled over the last seven years to $431.5 billion in 2007.