Other useful radioisotopes for radioactive dating include Uranium -235 (half-life = 704 million years), Uranium -238 (half-life = 4.5 billion years), Thorium-232 (half-life = 14 billion years) and Rubidium-87 (half-life = 49 billion years).
The use of various radioisotopes allows the dating of biological and geological samples with a high degree of accuracy.
I started having gay sex with Michael when I was 15 and it lasted for a few years.
He was the best kisser I have ever kissed and the sex was out of this world.
However, radioisotope dating may not work so well in the future.
Anything that dies after the 1940s, when Nuclear bombs, nuclear reactors and open-air nuclear tests started changing things, will be harder to date precisely.
So the ripe old age of 14 -- the age when you still have pimples, are as insecure as can be and are unlikely to get anything more than a kiss from a woman your own age -- is the only time when you can enjoy dating a woman your own age? Add seven to that, so you can date a 12-year-old -- an older woman"?