I've known two women that mentioned they'd rather date a man with a full head of hair who shaves his head than a balding man who shaves his head. I pressed it as far as asking "Well, what if they keep shaving it for life?" Same answer.
Personally I just felt like the relatively small amount of recession I had looked terrible on me because I already had a tall forehead to begin with, and I'm still in my 20s.
The only other people that might actually be able to tell it are my parents. Except for that, every other person to whom I mention I use finasteride and minoxidil says something of the sort: "wtf, you have a full, dense head of hair, why would you take anything?".
For some reason actors get a pass.
Keven Smith was tired of Bruce Willis talking about his weight. So, in a friendly guy's banter, he started calling him Cue Ball on a set.
Everyone said Bruce can make fun of us, but never mention his hair.
Whomever did Elon Musk's hair line did a good job.
Being able to spend a lot of time and money to look good does wonders to help take the sting out of whatever physical flaws one might have.
Not to mention most of them are generally attractive which also helps in a similar way.
So, you measure hair loss with the Norwood scale. You don't go from 100% hair to bald spots immediately.
First, you'll see diffuse thinning where the thickness of your hair drops significantly.
In the first stages of diffuse thinning, it won't be apparently to 99% of people that your hair is thinning but you'll immediately notice when you take a shower / apply shampoo (it's really obvious when your hair is wet).
I'd say that's when most men realize they're losing their hair and that's when they should get on Finasteride.