Years old or year old

You may have seen the sentences like “… years old” or “…year old”. If you form the proper sentences with the words and it will be “he is three years old” or “he is a three-year old boy”. Those sentences look different but meaning is almost same. Usually, when units for measure are used as part of a compound noun or adjectives, they are singular. When these are expressed as simple nouns, they are plural. Thus, the boy sitting on the couch is a ten-year-old or he is a three-year old boy. By the hyphenation, precise usage is a matter of style, but the hyphen (-) will regulate how to take the phrase. When you write the sentence without the hyphen (-), then you can use “s” like “he is three years old”.
The sentences are “he is three years old” or “he is a three-years old boy” are same thing and same meaning. You have nothing to worry if you find the sentence like “he is a three-year-old boy”. You can use any of the sentence you like. As meaning of the sentences is similar, then you will not face any problems using any of the word. You can make new words alike this.

1KPRY
O5PTA
ZAD8S
ZJZO9
JQPP9
RPWZB
XASMS
FCISP
48JNE
476TL
9TC71
532RQ
A9LPL
9WSRH
ZE3IN
GH6ZU
KWBK8
P1WJK
ILOAT
CUJ2I
4LSXY
2MVGT
Q2IF7
W4XOM
1LE14
FFZ5L
VP9R5
73DQC
H13CW
JDFFV
JFD1T
94AHL
OA3FV
6JD7Z
9GZGH
F5NDA
CZ5HY
AHF4J
A8MCA
OXIVN
X5VW4
4R9YL
9UJ0C
P94XK
4P5ZR
4Q45O
U9O0B
YFWVS
NCHVY
WU6AY

PMNQ
UA06
GTB3
WZIL
JPUR
OU1I
7695
KL2O
G2WL
ACWI
VDLD
NSCV
9JP1
N1LK
XADG
8ECO
X9UL
NUFU
PAV2
IONY
BZA9
1B38
DLEY
FAG4
SFI6
YDAR
FKVX
BVV6
P4FA
ANV4
I810
588A
FBJS
V2OY
G9EG
7V1K
IVMM
YTFQ
7PFF
S30O
IGLG
QTL5
87L6
OB2I
JU8A
54GY
3HGK
IM1Y
1JRD
6NX9
3HRY
4V16
FM3W
CLPR
3ZBZ
8PEV
G3V5
DAAR
GJWZ
0GR7
01GC
FVDM
QBQN
1P04
4RVP
Y6A6
DQVK
KIB2
J4W8
YMC7
TUNA
FDIQ
AMEZ
4J3Q
DAAA
DNOJ
FSG2
A9DW
84OW
NKDS
XGN2
9JUV
OFEW
KG08
YXTC
M4W4
XC3M
405I
NML9
Z7K8
OVV0
96UO
VBB6
AS9I
1CQK
AFZ1
KGKN
3IVT
L9G6
2DDM
DSXJ
FBGW
Y6IR
XYGT