Somewhere in Hollywood this wacky comedy script is being written with Steve Martin on the short list.
However, what you're suggesting isn't a solution. It's not even a band-aid. Imagine living your days worrying about whether or not you'd be exposed for being older than what you are. That would be maddening.
I'm only 28, but I fear what the career landscape will look like when I hit mid-life as well. My inclination is that the field has grown so much we're looking at peak-agism right now. Although I've never seen it in person, it makes me wonder when so many teams don't look like they have anyone over 40.
Also, at some point, I want to transition to working remotely for reasons completely unrelated to age. That'll mean I won't have to meet people in person, and I can always just use a heavily airbrushed picture taken at a cherry-picked angle for my LinkedIn headshot. Or, for that matter, I could use an older picture: I've seen so many people's using headshots (on both LinkedIn and their companies' staff pages) that were clearly taken over a decade ago. For example, the CEO of my first company was about 60 and had light gray hair, but his headshot on the company's staff page showed him to be in his 40s with dark brown hair.
Also, I do want to save up and get some cosmetic surgeries and other age-reduction treatments when I'm older. Not because of ageism in the industry, but because I have issues with aging in general and the idea of looking older personally disturbs me. If it helps keep me employed, it would be a nice side effect.
If it's hard to get hired as a black person, why not bleach your face white?
The real answer is that past a certain age, it's just shitty to be working for other people. But ... some companies have great projects that you can't work on anywhere else.
Way too many guys say "I don't like being around girls, but she's basically one of the guys so she's cool".