DENVER — Senior citizens are scrambling to figure out how to sign up to get their shots.

Many states and counties ask people 65 and older to make appointments online. But glitchy websites, overwhelmed phone lines and a patchwork of fast-changing rules are bedeviling older people who are often less tech-savvy, live far from vaccination sites and are more likely to not have internet access at all.

States have thrown open the line to many of the nation’s 54 million senior citizens with the blessing of President Donald Trump’s administration, though the minimum age varies from place to place at 65, 70 or higher.

Doctors and other health officials are saying there’s a flood of confusion, and some places are looking for solutions, like partnering with community groups.

The U.S. recorded an all-time high of 4,327 deaths on Tuesday, according to Johns Hopkins University. The nation’s overall death toll has topped 388,000.