+ pass the flower of (her) age

Concise Bible Dictionary:

Full manhood and womanhood (1 Sam. 2:33). 1 Corinthians 7:36 should read "if he pass the flower of his age."

Strong’s Dictionary of Greek Words:

Number:
5230 (find all occurrences in KJV Bible)
Greek:
ὑπέρακμος
Transliteration:
huperakmos
Phonic:
hoop-er’-ak-mos
Meaning:
from 5228 and the base of 188; beyond the "acme", i.e. figuratively (of a daughter) past the bloom (prime) of youth
KJV Usage:
+ pass the flower of (her) age