This isn't something I talk about at all, really, except with my spouse and occasionally my parents. Many people I know, including my in-laws, are still working in their mid-to-late 60s. With few exceptions, most of my fortysomething friends and peers are struggling with mortgage payments, child care, and, in some cases, massive student loans. Mentioning my plans for retirement by age 60 at the latest would be like rubbing salt in the wound. I don't want envy to strain our relationship or make anyone think they can ask for a loan or handout. If anything, I tend to downplay how soon I might be able to walk away with my 'stache.
I do have a couple of close friends who are super-responsible with their finances and therefore fun to discuss money management with. It's like we're members of a special secret club.
All you young people aiming for FIRE by your 30s are an inspiration! Even if your peers don't know your plans, realize that many of us on this board are proud of you.