Bit of an odd one, I'm early 30s, husband is 50 so friendship groups are very split in ages. Whilst I count them all as 'our' friends, I'll split this into mine and his for age ranges:
'My' friends (30s) are all seemingly happily married or in LT relationships. His (50s) are mainly divorced, or divorcing, or on second (some third) marriages. Only two couples still happily together.
There have been two incidents of physical DV that we were aware of. One was a consistent female abuser. The other was a couple who seemed to both be as bad as each other. Could never clearly see who started what. Heartbreaking situation.
One evidence of mental abuse in my friendship group, a gay couple - both female. Think this cut both ways too though, to be honest.
My friends are starting to have babies, only one friend has just have her second. His are dealing with teens, and definitely finding it harder. Only one SAHM in my group, there weren't any in his. I'm a full-time step parent, as is one of my other friends. Blended families becoming increasingly common, and people now no longer bat an eye.
My friends are still hungry for career advancement, chasing the big jobs and sacrificing home/work balance to get it. His (and him) are starting to look the other way, wanting to downsize their roles and find jobs that give them more time at home, less pressure with working hours, less travel etc.
Most people are struggling with mental health in some way or another. My lot are more feeling it with pressures to succeed, hit the 'expected benchmarks', keep up with the Jones's. My friends seem a lot more open to seeing counsellors, and many openly do. His are facing more home life related stress - kids, teens, relationship woes etc. Different, but both equally damaging.
Interestingly, it is my friends that are suffering more health wise, but think that is pure bad luck!