students have been on space for 370000000 age
earth is over_400_million_years_old. fetal_age is age. children has different_needs_at_different_ages youngness is age. world is millions_of_years_old. earth is 4.5_billion_years_old. world is billions_of_years_old. pyramids_of_egypt is over_4000_years_old. space is character. space_age is time.