31.71 years (Rounded to 4 significant figures). I used 1,000,000,000 for billion.
1,000,000,000/60 = 16666666.66 (recurring) minutes
16666666.66/60 = 277777.77 /recurring) hours
277777.77/24 = 11574.074 (recurring) days
11574.074/365 = 31.7097... years
But on a side note; the German "billion", for instance, has 3 more zeros so you would just have to do the same calculations but with 1,000,000,000,000.
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The age of the Earth is approximately 4.54 billion years, which can be represented in scientific notation as 4.54 x 10^9 years.
It is: 13,700,000,000 years or 1.37*1010 years in scientific notation
1.577836800*109
about 13.7 Billion years
10 billion years is about 3.1556926 x 1017 seconds.