  We consider the complex ind-group $G=\mathrm{SL}(\infty,\mathbb{C})$ and its
real forms $G^0=\mathrm{SU}(\infty,\infty)$, $\mathrm{SU}(p,\infty)$,
$\mathrm{SL}(\infty,\mathbb{R})$, $\mathrm{SL}(\infty,\mathbb{H})$. Our main
objects of study are the $G^0$-orbits on an ind-variety $G/P$ for an arbitrary
splitting parabolic ind-subgroup $P\subset G$. We prove that the intersection
of any $G^0$-orbit on $G/P$ with a finite-dimensional flag variety $G_n/P_n$
from a given exhaustion of $G/P$ via $G_n/P_n$ for $n\to\infty$, is a single
$(G^0\cap G_n)$-orbit. We also characterize all ind-varieties $G/P$ on which
there are finitely many $G^0$-orbits, and provide criteria for the existence of
open and closed $G^0$-orbits on $G/P$ in the case of infinitely many
$G^0$-orbits.
