citno -ci'o-cit-citn- gismu

x1 is young/youthful [relatively short in elapsed duration] by standard x2.

[also age (= nilnalci'o); (adjective:) x1 is junior]; (cf. cnino, slabu, verba)

In notes:

bavyfarvi
f1 ages / passes through time into future form f2 = b1 from current / past / earlier form f3 = b2 through stages f4.
citme'i
x1=m1=c1 is a younger sister of x2=m2.
citmle
m1 is cute to m2 in aspect m3.
citnau
n1=c1 is a youth/young man by standard c2.
citybu'a
x1=b1=c1 is a younger brother of x2=b2.
cnino
x1 is new/unfamiliar/novel to observer x2 in feature x3 (ka) by standard x4; x1 is a novelty.
djasluni
x1 is a common onion/bulb onion/garden onion (Allium cepa) of variety/breed x2.
jbeseltei
x1 (living thing) is of age x2 (time period since birth)
jo'ai
convert a selbri tag followed by a tanru unit to a tanru unit; differently from {jai}, it does not change the first place of the tanru unit.
laldo
x1 is old/aged [relatively long in elapsed duration] by standard x2
nalci'o
x1 is senior/older/other than young by standard x2.
niltolci'o
x1 is the age/oldness of x2 in aspect x3.
nunci'o
n1 is the youth of c1.
slabu
x1 is old/familiar/well-known to observer x2 in feature x3 (ka) by standard x4.
spartrifoli
s1 is a clover/trefoil (genus Trifolium) of species/strain/cultivar s2.
tolni'o
x1 is old (un-novel) to observer x2 in feature x3 (ka) by standard x4
verba
x1 is a child/kid/juvenile [a young person] of age x2, immature by standard x3.