How Does Speed Affect Aging and Time Perception?

[hurricane89]

ttp://www.youtube.com/watch?v=C2VMO7pcWhg

if somethings moving 80% the speed of light then itll age 1/5th as fast relative to you, moving 0.0000% the speed of light right

 

[HallsofIvy]

What, exactly is your question? No, if something is moving at 80% the speed of light, it will age at 3/5 your rate, not 1/5: if v= 0.8 c then t'= t sqrt(1- (.8c)^2/c^2)= t sqrt(1- .64)= t sqrt(.36)= t(.6)= (3/5)t.