Actually, I do know a little about science, but you are correct that I don't know how they do it. Please explain it to me.
As objects recede, the characteristic spectral lines of their elements (hydrogen, helium, etc.) are shifted toward to the lower, red, end of the color spectrum (whereas if approaching they shift toward the ultraviolet). Thus scientists measure the amount of this red shift to determine the receding speed and thus the distance, in light-years.
If you're really curious, do an internet search on "expanding universe," "red shift," "galactic distances," etc.
“Scientists crack me up, especially when they depend on taxpayer money to come up with this crap. How on earth could anyone calculate how old something is in space. Its rediculous”
“Please explain it to me.”
You made the stupid statement above, you can explain how you know it is “crap” and “ridiculous”. Go ahead, explain yourself.