Tens of millions of years.   Coal is a fossil fuel created from the remains of plants that lived  and died about 100 to 400 million years ago when parts of the earth  we â¦ re covered with huge swampy forests. Coal is classified as a  nonrenewable energy source because it takes millions of years to  form.
New Scooby episodes, in the original Scooby-Doo, Where Are You! format, were produced for each of these three seasons. Four of these episodes featured Scooby's dim-witted country cousin, Scooby-Dum, as a semi-regular character.
If you are referring to Scooby-Doo, the franchise, the first episode aired September 13, 1969, so about 43 years. If you are asking about Scooby-Doo, the character, he is â¦ said to be 7, but it's never actually been revealed or mentioned within any episode, movie, etc.