How does Earendil speak Beorian?

[Huinesoron]

Originally Posted by Tar Elenion

Where are you getting the ages from?

Well, in honesty I was just using whatever Tolkien Gateway said and using 'about' to cover myself, but:

Originally Posted by "HoME XI - Tale of Years, version D

502 [as amended] - In this year, or according to others the year before, Tuor wedded Idril... and in the spring of the year after was born in Gondolin Earendil Halfelven.
503 - Elwing the White daughter of Dior born in Ossiriand.
[...]
506-507 - At Yule Dior fought the sons of Feanor on the east marches of Doriath, and was slain. [...] The Lady Lindis escaped with Elwing, and came hardly to Ossir, with the Necklace and the Jewel. Thence hearing the rumour she fled to the Havens of Sirion.
[...]
510 - Midsummer. Assault and sack of Gondolin...

So if the final version of the ToY is the latest info we have, then Elwing was three at the sack of Doriath, and Earendil was 7 at the fall of Gondolin.

... and Elwing's mother (here Lindis, later Nimloth relative of Celeborn) escaped with her. Is there a source for her death in Doriath other than the published Silm? Did Christopher bump her off in "Of the Ruin of Doriath" just to avoid dealing with her at the Havens? o.O

hS