People can be so cruel to those whom they perceive as being behind in the life script. It's as if compassion and understanding dry up past an arbitrary point in one's life, especially in many cultures where one is expected to be fully independent and self-reliant by a societally designated age, taking no "hand outs" or assistance from others.
Success in adulthood seems to be solely measured by how self-sustaining you are, and how much you can achieve in a vacuum without relying on other people for help. Having child-like qualities such as vulnerability, affectiveness, and neediness are seen as undesirable deficits of personality and character, hence why insults like "man child" are quite frequently slung at those who cannot meet the steep expectations of adult life.
I think many people are blind to the fact that ill, developmentally delayed, or abused children will eventually age into sick, tired adults if they are not properly nurtured. That is a huge reason why so many mental health issues seem to persist from adolescence into adulthood. Compounding neglect, unmet needs, ostracisation, and poor life circumstances can snowball into tragedy once someone reaches the age of maturity and loses access to many avenues of support/safeguarding which are only offered to minors. One doesn't stop needing love, care, and support once they've existed on this rock for an arbitrary number of years. Development doesn't cease once we age to the magic number of 18 either.
This world is very cruel and harsh towards those who have been deemed as immature and unable to hit certain developmental goals and milestones, i.e. Land a well paying job, get into the housing market, master social graces, marry, have children, etc. This simply isn't feasible when so many of us are unhappy and merely trying to survive in the day to day, harboring the burden of unmet needs and childhood trauma, while navigating an increasing complex and convuluted world.
From personal experience, it seems like people don't actually seem to care how much we struggle with functioning in life, they care more about how it inconveniences or annoys them. Lots of people also seem to think that these issues boil down to a lack of motivation or willingness to engage with society, so they will use these tough love attitudes and sentiments about needing to grow up, act one's age, etc because they think it will be some sort of "wake up call." Instead, it usually just makes the other party feel more hurt and downtrodden, because the tough love crowd simply does not seem to understand what causes others issues in the first place and incorrectly attribute one's struggles to a lack of willpower and drive.
Many times, they do not even hold themselves to the same standards by which they hold those who are struggling, which is very hypocritical. I am only in my early 20s, so not as old as you all, but already experience the same harsh and judgemental attitudes from highly functional neurotypical people who expect me to wave a magic wand and not have autism or other disabilities anymore. They usually rely on their family members heavily though, so it's the pot calling the kettle black. It feels like an unspoken punishment for those who have a bad lot in life and lack a support system. We are expected to do everything on our own simply because we were born unlucky. Others don't have play by these rules, because they are blessed with supportive families and friends who encourage and help them.
My boyfriend's mother forbid him from advocating for me with medical staff anymore, berating me for being autistic and acting all meek and saying I need to grow the fuck up and how it's all my fault that I am this way, so I need to fix myself. Since I've been forced to do everything by myself, I have suffered way more bad conduct and nastiness because I freeze up and can't stand up for myself. One nurse on the phone was openly hostile with me because of how I stammer when I talk and struggle with spoken conversations, but when she found out I have autism she started laughing at me and said it all makes sense now. It's like a curse I can't ever escape.
I was abused for so many years during childhood and adulthood, but it doesn't matter to people like her, they have no compassion for what suffering adults go through. I have pretty bad ptsd, in addition to my physical diseases and autism, and go through periods of age regression where I feel emotionally vunerable and infantile, and end up cuddling with stuffed animals and engaging with media I enjoyed as a kid to try and feel safe. Feeling that vunerable is something most people will never understand. To them, it's a refusal to grow up and a rejection of personal responsibility.
If individuals had more compassion and understanding for those who were suffering, I bet there would be a lot less suicidality among older adults. Instead, the needs of that population are frequently cast to the wayside and treated as outbursts of immaturity rather than visceral displays of pain that convey a deep longing to be seen, heard, and treated like a real human being with unmet needs as opposed to a stroppy child throwing toys out of the pram.
The assumption that adults don't need love or care from time to time, alongside the expectation that we should all be stone faced stiff upper lip workers all the time, is killing so many.