I am sorry you feel this way @Noonesingsthischristmassong and yes, and I don't mean to sound rude but you did ask.... 44 is too old to try for another baby - you'll be 45 when you have the baby. Too old by far IMO.
Also, you seem to have some romanticised idea of this big lovely cuddly family like you get in Disney movies. Real life is not like that for many. My mom's 2 sisters (my maternal aunts) have 7 kids between them, (one 4, one 3.) All 7 are my cousins.
In the one lot with 4 siblings, the 2 don't speak to the other 2. And the other lot with 3 siblings; all 3 don't speak, and haven't for some 15 years. Totally separate lives, and all the children of those 3 siblings (8 in all) don't know their cousins. In addition, my 2 aunts fell out 3 or 4 years ago and have not spoken since.
I also know about half a dozen families with 5 to 8 siblings. Not ONE family has all the siblings who get on. Many are estranged and have split into little factions of 2 and 3. Some of the families have one member who is estranged, and has been pushed out of the family for some reason or other.
I have a brother, who I have always got on with OK, but frankly I never see him. He moved away some 12 years ago to the other side of the world, and I have seen him twice (in 2012 and 2014.) I don't even know my 2 nephews. (They're 11, and 9 now.) Same story with my DH. One brother, never been best mates but never enemies either. Just drifted apart... Hasn't seen him for 4 years. (He lives 50 miles from us.)
Real life is not like in the movies, or like Corrie and Eastenders where everyone lives closeby and is always there for one another.
I feel like it WAS like that some 40+ years ago, for me anyway. 7 cousins, a brother, large extended family, 4 grandparents, many friends... all within walking distance, big Christmases, beach holidays with 10 of us in 2 cars, and lovely long hot summers with 15 or so kids from the neighbourhood.... Playing footie, netball, hopscotch, and hide and seek, and cycling for miles, playing in the woods, and staying out from 9am til 9pm some days in the holidays and at weekends. Not like that now. Hasn't been for a LONG time.
I blame women being expected to go out to work, and have a career whilst also having a family, and the incredibly shit pay most people have now... (along with the high cost of living.) Community Spirit has gone, mums HAVE to work as well as dads to make ends meet, many couples don't stay together anymore, and families are fractured, and live at different ends of the country (and even different ends of the world.)
The life I knew pre mid 1980s has long gone......... And as I say, the big Disney family you speak of, really does not exist. Well, there probably are a handful, but probably less than 1% of families.
My 2 DC get on well (both mid to late 20s,) but even THEY moved away and live 15-20 miles from me and DH and about 10 miles from each other. And they only see each other maybe once a month. Me and DH see them together (all 4 of us,) maybe 7 or 8 times a year. So again, they didn't stay in the community. Their careers took them away. They live in urban areas now. Me and DH prefer the little rural village we live in.