Do you think I could get a job in theoretical physics/astro-physics later in life?

I'm a physics major myself, with plans to get into theoretical cosmology as I go along. It seems to me that astrophysics is not really something you can get into say, once you go to grad school. Most universities accepting students in that area are going to look for good grades and the difficulty and amount of physics, math and astronomy cles you've taken as an undergrad. My advisor told me that to be competitive for top spots in this subject, one might even try to take some graduate level cles in the area before even going to grad school. All that to say, astrophysics is great, but you want to make sure you can commit to it.