2000 Honda Civic Starting issue

Hi group,
My 2000 Honda civic is running fine. However, I noticed that the cranking
for starting the engine is lasting about two seconds more than it used to.
It is starting up in one crank everytime though. This is happening only when
it is a cold start. When the car is warmed up it is not doing it. I am
suspecting the battery which I never changed after buying the car. Its not
that big an issue, but I am afraid it is indicating something which I do not
know or may lead to something big. Should I go for a battery check up?
Thanks for the help,
Subha