i used to think the same when younger... not anymore. old have experience, true. Most of it is coming from different era, different world than current one. Apart from basic moral principles, for which you don't need age to conform to, their experiences didn't transfer well. Most of old are more or less completely lost in current fast-pacing world. they cling desperately to anything/anybody that still speaks to them and makes sense to them, no matter the content.

I can see it clearly all around, including my family. my parents, and I love them with all my heart, have simplistic views on politics (although both have university degree). easily to be persuaded, missing bigger picture and view beyond couple of months/years. my grandparents, they are completely lost in this world. they mostly look only what would affect their pension payouts and medical care fees. it doesn't matter if a proper gangster would be handling small financial favors to them, they would go that way.

older people are more invested? nope - we young will live much more of our lives in system that is coming compared to them. We have much more motivation to live in system that is stable and working well in long run (>20 years). it's fair to have same voting rights, but how much do we expect from usual > 70 years old in terms of clever voting decisions? Zero, and politicians know this, hence campaigns are quite emotional to work with them.