Pitt23
Hi, the film is probably closer to 40 years old...
Back then, I used Orwochrome – Process 9165; you can find the formulas on Google.
I once developed an UT18 into a black-and-white negative: Tetenal Ultrafin T-plus 1+4, 24°C, 12 minutes, continuous agitation.
Result: Nothing to write home about and some film damage (spots, tears), but I managed to produce reasonably legible enlargements. The owner was happy with his ‘rediscovered’ memories.
Good luck, Pitt