I think the twins thing will always be at play to some extent, no matter the age, or if they are identical/fraternal (though more so if identical), or whether you want it to The fact is that they are twins and always will be, but I love that about twins. It's that special something that they share, whether they like it or not!
Totally agree that I get more support from moms who have kids the same age as mine, twins or not!!