Check if Cpu is 64 bit or 32 bit in Linux

To not forget anymore…. All the new CPU support the 64 bit architecture. But If I have an almost-old CPU ? How can I check ?

…using the command lscpu.

[root@localhost ~]# lscpu
Architecture:          i686
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                2
On-line CPU(s) list:   0,1
Thread(s) per core:    1
Core(s) per socket:    2
CPU socket(s):         1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 15
Stepping:              13
CPU MHz:               1995.167
BogoMIPS:              3989.80
L1d cache:             32K
L1i cache:             32K
L2 cache:              2048K
NUMA node0 CPU(s):     0,1

The line to look is CPU op-mode(s).