how old is this furnace?

Just moved into a house with an old furnace. XX Century model# LKL-155 ser# KU 5264. This thing looks old i have already had to relight the pilot light once and now I went to turn the heat on and…the pilot light is lit but seems like the burners arent catching a flame. Wondering how old this thing is.

How old is the house?

My book (Prestons) goes back to 1965 and I have no model # to correspond with yours.

The furnace may be original to the house.

I didn’t see anything that corresponds with that ser# here either
You’re pretty close to my area, I’ll email you some info for a local heating guy