I think its admirable that you care and I think everyone should strive to be more like that.
However, just ask yourself as to whether you are regularly raising problems for them, or regularly presenting solutions (your spreadhseet idea sounds like the latter but just didnt go down well).
It sounds like you work in admin or operations? I would love it if our admin team took initiative like this. However, a few times they have, and sometimes what seems like a good idea to one person can often just end up creating a further layer of admin/'chore' for someone else whose then actual job is sidetracked with filling out forms and spreadsheets tracking their job (I can think of a few examples of systems in my current work where I can't help but feel things could be streamlined, but people kept having 'ideas' and now I have to fill out a myriad of necessary steps just to open a new job with a client). Obviously these things are important, and I'm not passing judgement on your ideas, but maybe try and reduce the amount of them by fully interrogating whether you think this will solve the problem form others' perspective, not just your own, and whether you are presenting solutions or just 'X system is outdated and needs replacing'. If you're having them as regularly as you say, either management are so unbelievably incompetent, or you're suggesting small incremental changes rather than bigger picture (and its the small icnremental suggestions that are annoying)
If you think things need a massive overhaul rather than just small incremental changes...do some research into systems, and put together a short proposal/business plan for management, showing how a joined up approach can solve certain pains and result in more time available for x,y,z (whatever earns the money).
As for the 'middle aged women' speaking up point- I guess everyone's answer to that is going to be anecdotal, but I am only 30 and can definitely think of several middle aged women as HR or office managers that have absolutely no qualms about sharing their ideas (again, often another blimmin spreadsheet to fill out which is where it gets annoying. Some have been very good ideas though, and well pitched).