In 1972 this assumption was shown to be highly questionable.
Despite this, the momentum gained in the two decades prior to 1972 has made 4.5 b.y.
For example the older the objects are the less Carbon-14 there is to measure.
With that being said only organisms the are younger than 50,000-60,000 years old.
The geological time scale and an age for the Earth of 4.5 b.y.
Radiometric Dating Carbon-14 is used in what is called carbon dating.
It is a variation of radiometric type of radiometric dating is only good for finding information about matter that once lived and used carbon dioxide.
It is hypothesised that the accretion of Earth began soon after the formation of the calcium-aluminium-rich inclusions and the meteorites.
Another drawback is that Carbon-14 is really susceptible to contamination.
When I first got involved in the creationism/evolution controversy, back in early 1995, I looked around for an article or book that explained radiometric dating in a way that nonscientists could understand. Young-Earth creationists -- that is, creationists who believe that Earth is no more than 10,000 years old -- are fond of attacking radiometric dating methods as being full of inaccuracies and riddled with sources of error.
A mathematical formula can be used to calculate the half-life from the number of breakdowns per second in a sample of the isotope.
Some isotopes have very long half-lives, measured in billions or even trillions of years.