"Even though we have made great progress addressing long-term rising health care costs with the passage of the Affordable Health Care Act, and even though the eligibility age for Social Security benefits is gradually increasing, it will do great harm to our economy and millions of seniors to raise the Medicare eligibility age or enact other significant cost-shifting alternatives," the lawmakers wrote.
House Minority Leader Nancy Pelosi (D-Calif.) was more pointed in her weekly press conference.
"Don't even think about raising the Medicare age," she said Thursday.
"We are not throwing America's seniors over the cliff to give a tax cut to the wealthiest people in America. We have clarity on that."
Proponents of raising the Medicare age from 65 to 67 say it is appropriate, giving rising life expectancy and the rapidly aging U.S. population.
Opponents argue it would raise premiums for Medicare beneficiaries and not save the federal government much money.
Thursday's letter came from, among others, Democratic Reps. Lloyd Doggett (Texas), Joe Courtney (Conn.), John Larson (Conn.), Louise Slaughter (N.Y.), John Lewis (Ga.), Jan Schakowsky (Ill.), Allyson Schwartz (Pa.), Raúl Grijalva (Ariz.), Frank Pallone (N.J.), Barney Frank (Mass.), John Tierney (Mass.), Danny Davis (Ill.), Henry Waxman (Calif.), Bobby ScottRobert (Bobby) Cortez ScottWatchdog: 7 members of Congress allegedly failed to disclose stock trades Pressure builds on Democratic leadership over HBCU funding Democrats hit crunch time for passing Biden agenda MORE (Va.), Kathy Castor (Fla.), Earl BlumenauerEarl BlumenauerProgressives push for fossil subsidy repeal in spending bill The Hill's Morning Report - Presented by Alibaba - House Democrats plagued by Biden agenda troubles Oregon legislature on the brink as Democrats push gerrymandered maps MORE (Ore.), Mel Watt (N.C.), Bill Pascrell (N.J.), Elijah Cummings (Md.), Al GreenAlexander (Al) N. GreenDemocratic anger grows over treatment of Haitian migrants Thousands march on Washington in voting rights push Rental aid emerges as new housing fight after eviction ban MORE (Texas), Janice Hahn (Calif.), Jim McDermottJames (Jim) Adelbert McDermottSondland has 'no intention of resigning,' associate says Three women accuse Gordon Sondland of sexual misconduct Portland hotel chain founded by Trump ambassador says boycott is attack on employees MORE (Wash.), Sheila Jackson LeeSheila Jackson LeeBlack Caucus meets with White House over treatment of Haitian migrants Angelina Jolie spotted in Capitol meeting with senators Elon Musk after Texas Gov. Abbott invokes him: 'I would prefer to stay out of politics' MORE (Texas), Judy Chu (Calif.), Robert Brady (Pa.), Charles Rangel (N.Y.), Gene GreenRaymond (Gene) Eugene GreenBottom line Texas New Members 2019 Two Democrats become first Texas Latinas to serve in Congress MORE (Texas), Rosa DeLauro (Conn.), Marcia FudgeMarcia FudgeBiden administration launches new national initiative to fight homelessness Sanders goes back to 2016 playbook to sell .5T budget Activists detail legal fight against HUD for Philadelphia housing MORE (Ohio), Corrine BrownCorrine BrownBottom line Former Florida rep sentenced to five years in prison for fraud, tax evasion Genuine veteran charities face a challenge beating the fakes MORE (Fla.), Eddie Bernice Johnson (Texas), John YarmuthJohn Allen YarmuthHouse panel set to take up Democrats' .5T bill this weekend The Hill's Morning Report - Presented by Alibaba - Biden jumps into frenzied Dem spending talks Pelosi signals she won't move .5T bill without Senate-House deal MORE (Ky.), Karen BassKaren Ruth BassThe Hill's Morning Report - Presented by Alibaba - Biden jumps into frenzied Dem spending talks Biden says he will review executive actions after police reform talks fail Lawmakers say police reform talks are over MORE (Calif.), Brad Miller (N.C.), Peter DeFazio (Ore.), Mike Honda (Calif.), Ted Deutch (Fla.), Yvette Clarke (N.Y.), Sam FarrSamuel (Sam) Sharon FarrMedical marijuana supporters hopeful about government funding bill Marijuana advocates to give away free joints on Capitol Hill DEA decision against reclassifying marijuana ignores public opinion MORE (Calif.), Jose Serrano (N.Y.), Bennie Thompson (Miss.), Alcee Hastings (Fla.), Jim Langevin (R.I.), Keith Ellison (Minn.), Rush Holt (N.J.), Paul Tonko (N.Y.), Tim BishopTimothy (Tim) Howard BishopOn The Trail: The political losers of 2020 Dem candidate 'struck by the parallels' between Trump's rise and Hitler's Dems separated by 29 votes in NY House primary MORE (N.Y.), Peter WelchPeter Francis WelchFailed drug vote points to bigger challenges for Democrats Shakespeare gets a congressional hearing in this year's 'Will on the Hill' Democrats debate shape of new Jan. 6 probe MORE (Vt.), Bill Keating (Mass.), Chellie Pingree (Maine), Colleen Hanabusa (Hawaii), Jim McGovern (Mass.), Jerrold Nadler (N.Y.), Steve Cohen (Tenn.), John Sarbanes (Md.), Linda Sanchez (Calif.), Doris Matsui (Calif.), Carolyn Maloney (N.Y.), Emanuel Cleaver (Mo.), Suzanne BonamiciSuzanne Marie BonamiciEnd the practice of hitting children in public schools How we can end the tragedy of elder abuse, neglect, and exploitation Shakespeare gets a congressional hearing in this year's 'Will on the Hill' MORE (Ore.), John GaramendiJohn Raymond GaramendiOvernight Defense & National Security — Iron Dome funding clears House Overnight Defense & National Security — Presented by AM General — Defense bill takes center stage WHIP LIST: How House Democrats say they'll vote on infrastructure bill MORE (Calif.), David Cicilline (R.I.), Donald Payne (N.J.), Jackie Speier (Calif.), Maxine Waters (Calif.), Kerry BentivolioKerry BentivolioIndiana Republican: Leaders duped me Reindeer farmer saves 'cromnibus' with yes vote High drama as .1T spending package advances by one vote MORE (Mich.), Lynn Woolsey (Calif.), Russ Carnahan (Mo.), Maurice Hinchey (N.Y.), John Olver (Mass.) and Betty Sutton (Ohio) and Del. Eleanor Holmes Norton (D-D.C.).
—This post was updated at 4:05 p.m.