I'm not a medical professional but it's clear that my mother's headed down that path. She gets very angry if anyone, in any way, suggests she might be elderly. The couple times I have suggested maybe she might not be acting rationally or that it would be good to plan for aging she gets very, very agitated and is in complete denial, "I am not old." "I am not crazy!" "I am not losing my mind!" "I do not forget things!" She lives with my dad who is more friendly but has always been utterly passive and is now disabled with memory issues of his own.
Is there any point to getting her to a psychiatrist or neurologist for a dementia diagnosis? She will be very, very angry at both the doctor and me. Already there is a total lack of trust when it comes to family, though she is all too happy to trust friendly strangers and keeps falling for scams, so it's not like I'd be losing that.