hi janet m
as with nitram and jenniferpa, I'm not entirely sure what you are asking, so I'll take a different tack
just because someone has a diagnosis of dementia it does not mean that they are automatically deemed to no longer have capacity to manage their own affairs and make their own decisions - there are members here who have been given a diagnosis; they post thoughtfully and helpfully, they drive, they run their own lives, they are active members of their communities - if they have granted Powers of Attorney to anyone, and registered those with the Office of the Public Guardian (OPG), then their Attorneys are waiting in the wings to support them, but currently have very little to do
an Attorney can help out the person they care for, with their finances, at any point, but only takes control of managing the person's financial affairs when they consider the person no longer has capacity to manage them for themselves - until then the person is free to deal with their own money, and to make decisions which may be extremely clever or utterly daft (as any adult is allowed to make silly mistakes)
and getting the diagnosis from a doctor doesn't mean that Powers of Attorney are somehow put in place - the POA documentation has to be filled in properly, signed, sent to the OPG, registered by them and sent back stamped by them before it is in effect and the Attorney has legal authority to act on the donor's behalf - then it can sit in a drawer for years before it is put to use
not everyone puts POAs in place and then someone has to apply to be the person's Deputy to be able to manage their finances
if you are an Attorney for your husband, this does not mean that he isn't allowed to deal with his own finances, or that the 2 of you can't continue as you always have done - until it is considered that he no longer has capacity; then you take over
sorry if this is teaching a grandmother to suck eggs
best wishes
PS - the above was written before your last post
definitely arrange for Powers of Attorney for finance & property AND health & welfare to be put in place asap - it's a good idea to do these for yourself too, as none of us know what lies in the future and someone who is a joint & several Attorney with you for your husband, or a replacement Attorney, and an Attorney for you could step in and support your husband and yourself eg if you have to go into hospital for a long stay and long recuperation
and even a wife does not have the legal authority to deal with her husband's affairs, once he no longer has capacity, without POA