Lisalou, based on my own experience I feel you should not worry about it in any way. I am seventy-five and thankfully still fully fit with no chronic ailments, but like yourself often forget why I have entered a room, what tool i wanted when i opened my tool box or what it was my wife asked me to get while passing the shops.
My wife and i did plan to retire in 2013, but due to a serious road traffic accident to one of the persons who bought the Business from us meaning that he will never work again in all probability, we bought back into the business in 2015, and we are still there.
In that office working environment I very often sit down at a work station and then cannot remember what it was i am supposed to be doing there. Staff often ask if have followed through on something they have requested of me, and i say "oh I have not had time yet' when it is, in reality, i have often forgotten.
My wife who works on accounts and administration in the business often has similar experiences, but the busy life of the office means we do not have time to dwell on the matter, and that i feel is the way to deal with the problem.
If you just keep busy with your mind engaged then these lapses of memory etc will not concern you as thoughts rapidly turn to other matters in hand. All middle-aged and senior persons find themselves having lapses on memory, but it is very often just part of the ageing process and nothing more than that.
So Lisalou, stop worrying, keep mentally busy, and i am sure all the world will be well with you.
Hope this helps.