Don't worry about age. I earned my CNA at 26. Now I am 30 and on the BSN track for summa. The oldest man I have seen earn his CNA was in his sixties. Nobody is going to look down on you if you're pleasant to be around, dependable, and fun to work with. You will probably meet and fit right in with other people your age. The profession is widely like an intramural sport: By and large everyone wants to help each other out and age isn't important.
Many universities also love and welcome us non-traditionals. Many older adults feel as though higher-education is out of reach. But even at my age I have a great shot at MD/DO/NP programs. If you have a bachelor's from your aerospace experience, then consider looking into an accelerated BSN program.
Male issues in the field? My impression is that we're apt to be charged with the most laborious tasks. Nursing is unfortunately associated with back injuries and an overall physical toll. Coworkers might think of you and enlist your help for the next bariatric or combative client. There are also some clients with preferences against a man caring for them. There might be situations where a chauffeur might be appropriate as you work with some individuals. By conducting yourself professionally, while also assessing the level of comfort of those you care for, there is nothing to be scared of.