I may be wrong about the bit where I said they would hope an adoptive parent would see a child to adulthood, but I think I am probably correct in that, but do check. If you adopted a child of 5 then they would turn 18 when your dp was 73. Most people live well beyond 73 these days. I am sorry, this sounds awfully morbid and I think the reality is that if you were approved to adopt then you would probably find that slightly older children, 4, 5 etc would be a possibility as many people do prefer under school age. Our son was 3, almost 4 when he came home and he is still a very small person, he still wanted to be lifted and carried a bit etc but now walks very well everywhere and has grown up a fair bit!
Honestly when they are young (3, 4, 5, 6 etc they are still very much like babies, lots of hugs and cuddles etc, it is very rewarding). I think you do need to think if you would like a baby or younger child and to be realistic about what you can cope with as a family and also what age of child you may be able to adopt. It certainly does not need to be a teenager. I am almost 50 and we were able to adopt a three year old no problems at all. And I have heard of older people considered for younger children in some circumstances.
Also, personally, I would make sure you really are done with IVF if you have any doubts do think about this before moving on. Donor eggs might be a way to go, if you feel it is right. There can be high costs and there can be a wait, although if you go abroad less so on both fronts.
I had three rounds of IVF with donor eggs in the UK, please feel free to pm me if you wish to ask anything.
We have a birth child and after her birth I found my egg supply was running out (I was over 40 by then) and also I think I had some immunology issues, which I tried to have treated. Even with donor eggs and immunology treatment I still failed to get pregnant so eventually concluded adoption was our only way. I am very happy to be going down this route, our little one has been home about 4 months and is wonderful.
I hope I have not discouraged you.
It really is (in my very humble opinion) worth working out whether adoption could be a reality for you, what age of child it may be possible to adopt etc, sooner rather than later. Remember you can shop around for a local council and see where you are best received.
Making those decisions now (which county/local council or agency to go with), giving yourself most time to research etc can be done before starting the adoption process (as you know you need to wait 6 months is up after your fertility treatment. If you feel after during your explorations that adoption is not for you, for any reason, you can explore more treatment if you feel it is right for you.
I am so sorry that your treatment did not work and that you miscarried. I had a very early miscarriage over 7 years ago and I still very occasionally think of it. But I have got over it and time really does heal.
If I may also say that in terms of treatment working there may be things that could make it work better if you tried it again but I would not want to go into it all on an open thread but rather chat to you if you wish to. As you know my further IVF treatment did not work so I am not speaking from experience personally, just wondering about things generally and whether you are really ready to give up IVF or whether it is just too painful to contemplate at the moment (which, if that is the case, is totally understandable but as I say, time does heal to some extent).
Bless you, it is tough, but knowledge really is power so if I were you I would not put off finding out all you can about your chances with adoption before making any definite decisions.