Pilot is lit, but will not ignite full flame when oven is turned on?

So, that is it in the nutshell. Last night I turned on my gas oven and it took me over 1/2 an hour of turning it off, turning it back on. I see the pilot is lit and when I turn the oven knob, the flame gets a little bigger but the entire bar does not ignite into the flame it is supposed to.

Could it be a clogged pin hole? An ignitor? I have lived in mu house for 13 years and the oven was there when I bought the house, so I am not sure how old it is and perhaps it just needs to be replaced?

Any suggestions would be helpful,

Thanks!!