I'm 43 and recognising a lot of this, my main emotions seem to be 0-100 anger and apathy in equal parts.
I just don't care about stuff like I used to, but equally if I do care it's probably because it's made me angry.
I'm just not interested in the gossip mill at work or who Mrs X from number 20 is shagging, and rather than feigning interest like I used to, to keep people happy, I just shrug and carry on with my day. I'm also not bothered about people bitching and twittering about me - unless it's an accusation of something unfair or that isn't true, then I'm angry and will set people straight - but without the pandering, tearful, apologetic way I used to be. It's straight to the point and dispenses with the bullshit.
I'm not bothered about an atmosphere either if someone else is offended by something I've done or they perceive I've done, if I'm wrong then I'll apologise but I've got no time for grudge holding and post mortems and 'lets discuss this further' and raking over stuff all the time.
But the brain fog, fatigue and inability sometimes to grasp the simplest of concepts is really pissing me off.
I'm still regular but don't have a lot of the issues around my periods I used to, and have noticed other changes too that point to peri, but as a pp wondered, I also want to know that when it gets to HRT stage, will I keep this new found not giving a fuck?!