I have a twin sister, rubyslippers. so could not have had less of an age gap we had lots and lots and lots of fights. but as we got older, we got on better and better.. and i would say the last 12 years or so have been a revelation, and i am so glad that i have such a wonderful sister
we also have a brother who is 6 years younger, who we get on with just fine... we loved to 'mummy' him , possibly we were slightly disappointed to have not been provided with a baby sister called sophie, as we had requesed!
i have just short of 6 years between my 2, not by choice, and it has worked for us really well. yes, some jealousy, but i am not that great with small babies. so it was good to have DS at shcool and the daytime to concentrate on DD, two under 3 for example , would have finished me off
it is what works for you and your family, and if you are lucky enough and blessed enough to get what you want then enjoy every moment, and don;t over think it !
it is very often a case of getting what you are given, when you are given it.
i had a friend TTC when i was, desperate for a summer baby, and she had a winter baby.. whereas i had a summer baby,and could not have cared one jot.. she was getting quite stressed about the whole thing, some things, you just cannot plan.