Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!

Qenya 

olaste

noun. growth

A noun appearing as ᴹQ. {alaste >>} olaste “growth” in the Quenya Verbal System (QVS) of 1948 as a combination of {ala- >>} ᴹQ. ola- “grow” with the general action suffix ᴹQ. -ste (PE22/110).

Neo-Quenya: Since Tolkien revised the general action suffix to -sta a few years later, I would update this noun to ᴺQ. olasta “growth” for purposes of Neo-Quenya. I would use this word for “growth” in general, both physical and metaphorical, as opposed to olmië as the period or process of life where one is growing.