What Tolkien Officially Said About Elf Sex (2002)

(The Grey Havens, ROTK) Tolkien describes the differences between the elvish sexes as follows in LACE:

He goes on to explain differences in career preferences between the sexes and concludes with “But all these things, and other matters of labor and play…may at different times be pursued by any among the Noldor, be they neri or nissi.” Sex = Marriage, Even On the Run

Tolkien describes elvish marriage in detail in the LACE essay. Normal Elves And The Ones Tolkien Wrote About

Tolkien in LACE says that elves normally married young, in their early adulthood, which would have been at 50 to 100 years old.

Source: www.ansereg.com