I'll hit 50 in a few months and the least year or two for me have been eye-openers. Try to do the things you used to do and think you should be able to do....and your body fights you tooth and nail. I mean I'm not in the worlds best shape or anything but still. That wall is real.
My eye opener was when I went to the Dr for a stuffy nose. The look of concern when she listened to my lungs as she asked my age rattled me. IDK why everyone complains so much about aches tho. I count myself lucky.