Here's a number to sit with: 63 years. That's the age gap between the oldest and the youngest person serving in Congress right now. Sixty-three years is longer than most entire careers. It's the distance between someone who could remember the moon landing as breaking news and someone who grew up with a smartphone already in his pocket. Both of these people cast the exact same one vote on the exact same bills, in the exact same building, under the exact same rules. That's the whole point of this post. Not to shame anyone for their birth year, but to make you actually feel the scale of the spread that exists inside a single lawmaking body, because a spread this wide changes how you should read everything else on this site.
The oldest currently serving member of Congress is Chuck Grassley, a senator from Iowa, who is 92 years old. Our completion probability model, which estimates the likelihood a member finishes their current term, puts Grassley at 7 percent. That is not a judgment on him personally, and it's not speculation about his health. It's a statistical estimate drawn from actuarial data about what a 92-year-old's odds look like over the span of a full Senate term.
The youngest currently serving member is Maxwell Frost, a House member from Florida, who is 29 years old. His completion probability sits at 99 percent, about as close to a lock as this model produces.
Subtract 29 from 92 and you get the headline number: a 63-year age gap between the two ends of the same institution. Same building, same votes, same rules, same retirement system. Wildly different odds of simply being around to finish out the term they were elected to. Sit with that contrast for a second: 7 percent versus 99 percent, sitting in the same Congress, voting on the same laws that will govern all of us.
This isn't a trivia stat. It's a lens for reading everything else on this site. When you look at any member's page and see a completion probability, that number isn't decoration, it's a real, calculated estimate of whether the person you voted for, or didn't, will actually be around to finish the job. A 7 percent completion probability and a 99 percent completion probability sitting in the same chamber tells you that Congress isn't one demographic making decisions together. It's closer to multiple generations, with wildly different stakes in the long-term consequences of their own votes, all pulling the same levers at the same time.
Think about what that means practically. Legislation on climate policy, on the national debt, on the future of Social Security, gets shaped by people who will experience the consequences on completely different timelines. That's not automatically corrupt or wrong, but it is a structural fact voters deserve to see clearly, not buried in a press release or smoothed over in a floor speech. Use the age gap number as your gut check whenever you're evaluating a vote or a policy fight: ask yourself who in that room is actually going to live long enough to own the outcome, and who's writing rules for a future they may never see. That question doesn't require partisanship. It just requires arithmetic, and arithmetic is exactly what this site provides.
The age gap is simple arithmetic: it's the age of the oldest currently serving member minus the age of the youngest currently serving member, recalculated continuously as members join, leave, or have birthdays. Right now that's Grassley at 92 and Frost at 29, a gap of 63 years. Tomorrow it could shift by a birthday. That's why we treat this as a living number, not a fixed headline.
The completion probability figure is a separate calculation. It estimates, for each currently serving member, the likelihood they complete their current term based on established actuarial data. It is not a prediction about any individual's health, and it isn't a guess we're pulling out of thin air. It's a statistical estimate, the same kind actuaries use for life insurance and pension planning, applied transparently and consistently to every single person who writes our laws, from the youngest House member to the oldest senator.
This is just one slice of the dataset. If you want to see exactly how we define, source, and calculate every number on this site, including completion probability for every sitting member, the full breakdown lives at toodamnold.com/data. Go look. The more people understand how these numbers are built, the harder it gets for anyone to wave them away.