Yep this. The average rate of return is 10% so this is someone who can make $50k a year just off this money alone. The real median wage in the USA for workers who worked full time in 2020 was $56k. This person has enough money to nearly replicate the financial success of your average American via a do-nothing secondary income. Your average American retires with only $200k saved up by age 65 as well. $500k is a lot of money and its bothersome that its being played up here as being unsuccessful.
This person is doing very, very well and I suspect "I only have half a million dollars sitting idly by" is a humble-brag as that is obviously a lot of money.
Also 35 isn't 65. This is the prime age for most business people, artists, writers, etc. This is typically a professional and creative peak that lasts, at least, another decade or so. A person this age often has the drive and vitality of youth but the wisdom of someone older. Its no wonder so many great works are created by people around this age.
I think this post says a lot about the demographic here who lean towards worshipping money to the point where having half a million is being "unsuccessful" and being merely 35 is being "old." Capitalism does a great job of making people feel bad about themselves because they arent mega millionaires and commercial media sells images of youth because promoting anti aging things like makeup, drugs, surgeries, fitness, etc is so profitable. Hiring managers also discriminate on age because working young and naive people like dogs and leading them to burn out is "good business sense," while dealing with an older person who knows this con and understands class struggle and the dishonesty of management and the perverse incentive profit demands is "bad business."
My advice is that forums are a very, very poor place to get therapy. Go see a professional if you feel depressed. Forums like these are just echo chambers full of people with similar unresolved issues or with coping mechanisms that aren't healthy. And egotists who just want to tell you their life story, knowing full well stories aren't healing because if they were, we could cure all our malaise with just biographies of people who struggle.
So, no "fitness" or "hobbies" or "kids"[1] isn't it, maybe some of those things is part of it, but there's a lot more a human being needs who has lost their way in an ultra capitalist and competitive society. Part of it is seeing the forest for the trees and a professional can help them get the rational self-awareness they seem to lack, as well as address their emotional issues.
[1] If you are not dying to have kids then you shouldn't not have kids. There is a lot of toxic advice here about having children to "fix" things. Children should not be born as a way to fix yourself. It is 100% valid to not want children. I say this as a parent. Its a grueling and hard life compared to not having children, and if you have difficulty in life and don't even want kids, do not have them. They will not magically suddenly fulfill you or make your life easier. In fact, in many ways they will make things much harder for you in literally every avenue in your life. The world does not need more unwanted children or children used a marriage or personal emotional fixers.