From my perspective, our company has a lot of folks that have been here for a very long time and have a ton of Institutional knowledge (going on 30 myself). We were taught the ins and outs of the business. The new way (and I don’t think it is unique to us) is to master some skills or data knowledge and use those to manage people.. I think experienced employees sometimes come off as defensive of newer thinking or methods (me too) because those things do not replace having that core knowledge. As people retire, leave for new opportunities, or sadly perhaps get riffed because of their perceived lack of cooperation, this company is really going to be in trouble. There are places and processes where this is already happening and the newer folks continue to try and work through things with brute force and insulting comments to those of us helping to keep the train on the tracks.
I hope you understand your contribution to the firm is important. It is not acceptable for people to exhibit ageism, but I am not sure we have an appropriate support system for those that might. HR exists in the form of a call center. Management has objectives that have little to do with taking care of people (forced ranking, insulting rewards, blinders on the corporate world wfh dealings, RTO mandatory except for new hires in other locations). Hang in there!
(And before someone tries to say I am not accepting of new ways, know I connect with people of all ages, mentor younger promising employees, and also strive to modernize everything I touch here).