Relativity has been so hard for me to understand! One minute, it makes sense, and the next I am lost. I kind of understand how time can go slower based on the view it is taken from, but I can't understand how a person could actually not get older? That is, if the person is going really fast: "Suppose that a 25 year old mother leaves on a rocket trip. She travels at .99 c relative to the earth and is gone for 30 years measured by earthtime (=t). How old is the mother, in terms of physiological age, when she returns? How old is her daughter, who was 2 when the mother left?" So, the mother comes back and is 29.23 years old, and her 2 year old daughter is now 32 years old. It doesn't make sense...but it does...Of course, no one can go .99 c (99% the speed of light, right) I don't even know what I am going for anymore. I can't even find out the answer to the question I wrote above, for it all is just too confusing. But, at the moment I did it in class, it was okay. Sorry, I am just too lost to even figure out what I am trying to ask!