My kids are 21, almost 20, 17, and 14 months. The 21 year old has lived with her father since she was 6 months old, so essentially I have three kids. I wanted dd2 and ds1 to be spaced more closely than they are because I always felt inadequate growing up with a sister who was three years older than myself and both me and my mother (who has a sister 4 years older) still struggle with negative attitudes towards babies and our own childlike aspects, i.e. "baby, baby stick your head in gravy" type taunts that we have internalized.
I wouldn't say that my dyad is naturally spaced, since they were born in the context of a brief but unfortunate marriage and our sex life wan't the greatest or what I would consider "normal". but i will say that the first year was EXHAUSTING and made me glad that I didn't get the closer spacing that i wanted.
My childrens' personalities did not mesh as well as my sister's and mine did. They are not close, do not like each other right now, and dd2 has a lot of resentment. She also feels that she lived in the shadow of a "ghost sister" (dd1). For these reasons, as well as my own difficulties in establishing and maintaining relationships and (perhaps unrealistically high) standards I had for a new partner, I kept putting off having another baby.
Things weren't perfect when I started TTC ds2, but I did know that I couldn't wait any longer and still have a reasonable chance of becoming pregnant and carrying that pregnancy to term.
This time I had unrealistically LOW standards of sibling relationships and expected the older kids to be more like an aunt and uncle and ds2 to be raised essentially as an only child.
I was mistaken. the ginormous age spacing has been DELIGHTFUL for my family! The older kids are very much siblings and not "spare parents" and I have the perspective to enjoy ds so much more than I could when i was younger.We run into weird situations and conflicts of interest and I don't have the support of oodles of people who know just how I feel because they have been there too, but then again I don't run into the judgement if I do things differently than they did either.
I was really playing "chicken" with menopause too much for it to be morally acceptable to recommend that ANYONE follow my path with the 19, 18, and 16 year age gaps, but I did want to reassure you that unconventional does not always equal "bad" and that if life circumstances are too overwhelming for you to TTC with perfect 2-4 year spacing, that it is okay to wait and enjoy larger spacings with better life circumstances.
Anyway, I love my little son and although life is never boring with my teens/young adults, having a much-younger sibling has been a very positive experience for all of them.
dd1 may still choose to "come home" someday too. The courts can't tell her not to any more.
