I’m sorry to read that you have found yourselves in this situation. It is a truly difficult decision to make.
We have a 21 year old son with DS (and DS 20, DD 15, DS 14). We were in our mid twenties when he was diagnosed at birth. It was a colossal shock. He has always been adorable, funny and most importantly fit and well. Mainstream school and now in Mainstream College doing a Hospitality course. Swims at a very high level three times a week. Has a (very) part time waiting on job. He is moving to supported living next Spring.
Our other children adore him and they certainly would never imagine a childhood without a sibling with DS. He is an important part of the jigsaw of our family. Our other children have benefited from having a sibling with SEN in that every achievement no matter how teeny is joyously celebrated and milestones happen when they happen for them all.
However I was 26 when he was born, it was a birth diagnosis (so thankfully we didn’t find ourselves in your situation). And had young grandparents on both sides.
So we are in our mid 40’s now. It has been a rollercoaster ride. Not as far as caring for him, as he more than makes up for the extra time and care that he required. And I adore very bone in his body. But the involvement with additional services, meetings at school, advocacy for health and finance. It has been a learning curve. We are almost at the point where we’ll be able to have some time travelling as a couple when he moves out and the others become more independent, simply because we were almost 20 years younger than you are. Although, thats having kids anyway.
If I found my self pregnant today (would need a bloody miracle as I’m post-menopausal 😂) I would be strongly leaning towards termination and if there was a DS diagnosis I think it would be a definite. But that is bearing in mind our situation and our family is complete (and expensive enough).
I’m sure my ramblings haven’t helped, but that’s my ten pence worth. Sending hugs and please feel free to PM me.