AARP, a group that advocates for senior citizens and other older Americans, shares her concern. The organization sent a letter to Congress yesterday saying the proposed bill would "dramatically increase health care costs for Americans aged 50-64."

Many seniors could face a significant increase in health care premiums, since insurance companies will be allowed to charge seniors five times as much as for younger people for a comparable plan. Under the current Affordable Care Act (ACA), insurers are limited to charging three times as much. The tax credits proposed in the AHCA, which would be dispensed mainly on the basis of age and income, would be smaller for older Americans compared with under the ACA, making insurance even more expensive for them.

"Taken together, premiums for older adults could increase by as much as $3,600 for a 55-year-old earning $25,000 a year, $7,000 for a 64-year-old earning $25,000 a year and up to $8,400 for a 64-year-old earning $15,000 a year," AARP said in its letter. The group said a typical senior seeking insurance on a state exchange has an annual income under $25,000.