Not sure if anyone can help. My FIL has quite suddenly (within the last 5 years, not just post covid,) gone from being a normal 60-something to what most people would expect from a much older man. Even my DHs grandmother (FIL's mum,) and aunt (FIL's sister,) have commented on this, so it's not just us.
DH is upset and a bit exasperated by this, I think because he thinks some of it is due to FIL giving up/not trying to be and MIL is obviously taking a fair bit of the brunt of it, as she's found herself slipped into slightly more of a caring position when no one expects this for a 69 year old.
I wonder however if there could be something diagnosable behind it (and if so, possibly something treatable?) It's been a pretty fast change, which is why I wonder. My mother developed a thyroid problem in her 50s which made her really tired, among other symptoms, but once diagnosed and operated on went straight back being a normal, healthy, active person - literally within a couple of weeks.
Am I being mad/is this wishful thinking? Who or what would you ask if trying to check?