1 Valian Year = 1000 Valian days, or 12,000 Valian hours

Fëanor started making the Silmarils in 1449, and finished them in 1450 in the Years of the Trees, which in our time count should have taken about 9.5 to 10 years.

Amrod and Amras, in my version, were born in 1450 Y.T., which is within the same year Fëanor succeeded in making the Silmarils, making them the youngest of Finwë's many grandchildren.

It is my canon belief that the Eldar in Aman, who lived in the light of the Two Trees, mature physically much more slowly than the Eldar who lived without the light in Beleriand. So those who were born and matured one Valian year in Aman, they matured at the regular pace the Beleriand Elves did within twelve months in their year cycle, which is a lot more quickly than the Light Elves.


It had been a blessed day for the twins to say 'Ammë' to Nerdanel, but Fëanàro filled with true joy by the time they learned to say 'Atya' with their mother's encouragement, for he feared his time in the forge had made him miss even the smallest moments he had with his red-head babes, who were learning and adapting with more promising haste than their undersized bodies suggested.

Like any other Elf-child, by the time they reached the end of their first year into the world (their second year since their begetting), Ambarussa were walking with sure (albeit hasty) steps and talking in clearer sentences.

When they were born, pre-mature as they both were, there had been a wide-spread fear that the twins were so small and weak that they wouldn't make it by the end of their first month...but so long as they were together, giving each other their strength and support, Ambarussa were accomplishing all that they needed to and more.

They were still small and frailer than they ought to be, no matter how much they were fed, but by the time they learned how to walk, how to run, they had far more energy in their little limbs than everyone would have thought.

Possibly more so than Turko, who had already been an absolute menace in his earliest years, the moment he learned how to walk (which somehow survived to his adulthood half the time, everyone not-so-secretly thought aloud).

With far more times than he can count, Fëanàro found a few of his older sons chasing down a naked set of giggling twins toddling rapidly down the halls with clothes in their hands, only for him to easily scoop them up his his cage-like arms and kiss their squirming little bodies into loving submission.

Once they were able to say words more clearly, such as 'please' and 'want' and 'yes' and 'no,' Fëanàro had tasked Neylo to help the twins practice stringing sentences together with each little word they used, like he had done for all of his sons in their infancy.

No son of Fëanàro would go around babbling half-coherent words by the end of the Year.


Ambarussa are still physically and mentally babies within their first Valian year (9-10 of our solar years), whereas if they grew at that same time and pace in Beleriand, away from the light of the Trees, they would have physically and mentally grew resembling 3-4 year old tots by then, which is what a ten year-old Elfling would look like in Solar years.

Yes, I am implying that (in theory), Fëanor was physically around 300 years old when he led to Noldor to rebellion at the Aman rate, though I believe his mind (with all his grief and genius) developed at the Beleriand rate (which is ten-times faster within the Valian rate), given his spiritual disconnection with the Valar and their slower-paced development of things in Valinor. That's why I think Tolkien sources found it necessary to mention his Solar-year age despite never having seen the Sun, like Finwë.