50+ Year Old Furnace

I have a Homart furnace that's around fifty years old. Sold by Sears & Roebuck back in the day. It's a beast, and it keeps on ticking.

You can see a YouTube video of it by Googling:

"old 1967 sears homart gas furnace still going strong"

I'm thinking I shouldn't replace it. Thoughts?

source https://hvac-talk.com/vbb/showthread.php?2226780-50-Year-Old-Furnace&goto=newpost