Related but an off-shoot question, people who are "settled down," in your late 20's/30's/40's/50's/60's, have families and various obligations, how do you deal with loneliness?
As someone who is on the precipice of turning 30 (27 currently), speaking strictly for myself - I've found that loneliness for me and my older peers is different from the angst of adolescence a la Holden. Tbh, younger people tend to think in more black and white terms and very ambitious but most haven't gone through the "test" of one's vulnerability and limitation. Unfortunately, we also live in a marketing society that sells products and dreams on the Fear of Missing Out (FOMO) that exploit the impressionable young people (e.g., the "MTV" high school memories with the "Coke" concert experience with friends; the "Ivy League" class room experience, the "Liberal Arts" self-exploration, the "Sexy-Times" with la-femme-de-Zooey Deschanel and "Peter Thiel/Steve Jobs entrepreneur" iconoclasm).
Whereas I was a jack-ass when I was 21, thinking I was special and therefore deserved and expected external tokens of accomplishments at every stage in my life (I was crestfallen at age 21 after being rejected by YC because I couldn't post a smug post on FB to snub all of my classmates and friends; and most importantly, have that as a validation to my insecure self-worth; a loneliness stemming out of FOMO). My loneliness nowadays is more centered around the splintering of between mine and my friends and acquaintances' goals and vision.
Some of my friends are still going at it with early twenties vision of grad school, startups and traveling, albeit with some bruises and splints. Some of my friends have fully "embraced" adulthood, complete with jumbo mortgage loans and X month into pregnancy and parenting books and diapers. Friendships/liasons have changed from one-on-one interaction to couples or single "dating" another couple or single. But most alarmingly, how much less I care and am affected by my peers' ideas and vision because how much I've fully embraced my own vulnerabilities/personality and focused fully to vest on my own ideas.
People who have past their 20's, how do you deal with loneliness? Do you focus on your family or really close friends after twenties, or do you focus on pursuing your own ideas with a community of likely-minded people, or do you come up with some kind of philosophical reconciliation?