But there's more. One thought on reading your post. It's kind of an extension of Jefferson's idea that the earth belongs exclusively to the living and the dead have no powers or rights over it. From Jefferson's letter to Madison in 1789.
Now, granted, those in their 80's aren't dead yet, but legislation passed by the McConnell's, Grassley's and even Bernie's of the US Congress, even worse, SCOTUS decisions, have multi generational impacts, and as we've seen, can be damn difficult reverse. The rub being, none of those people will live to see the full repercussions.
If you're 80 you have maybe a decade to a decade and a half left. People in their 30's have 5 to 6 TIMES longer to live with those repercussions. Should they not have the greater say in the matter? Madison responded to Jefferson that predecessors leave a valuable legacy. But not always. Some things are universal truths and span generations, but many things do not. They based their decisions on the world they lived in that may not fully exist anymore. Even while they're still alive.
Obviously there's the argument of experience. I'm approaching mid 60's, and professionally, when it comes to decision making, I'm better than my much younger colleagues. Ironically, faster. Simply because I've been there before. But even if I haven't been exactly there, I still have a good feel for the pitfalls. Similar things that didn't work and why they didn't work. Then again, I've got maybe half a decade left before retirement, maybe more. Those younger colleagues may have to live with the mistakes made by guys like me who've sailed off into retirement. Decisions that made sense at the time but no longer do. Maybe my experience just wasn't valid anymore in an economic environment that's changed drastically since I had a full head of hair.
Not only is there a physical dimension. We may not fully understand the world younger generations live in. Humans are stubborn creatures who don't like change. But reality doesn't care. It keeps changing.
Short answer, yes, there should be age limits. Revised on occasion as human longevity changes. And younger members should have far more say than they have now. They're the one's who are going to have to live with these decisions long after we're gone.
https://tile.loc.gov/storage-services/service/mss/mtj/mtj1/011/011_0912_0958.pdf