So here things get interesting.
I worked on videos of two versions of this set - the first was my Sifu Wing Lam, the second was for Sifu Chan Sau Chung (the Monkey King.) They are two different sets, but share a simliar root. Sifu Chan's seems older to me, based just on intuition. It's much shorter and simpler. We had a thread about this here a while back.
Originally, I translated this as 'nine province' after an explanation that Sifu Lam gave me. When I did the work for Sifu Chan, I went back to the characters and discovered that 'nine continents' was more correct, desptie that fact that there are only seven continents. Apparently, in ancient China, they beleived that there were nine. I suppose you could date the origin if you could figure out when that was.
I've listed both lyrics here and even in the lyrics, you can see some parallels.

GUO JOW CHAI MEI GUAN: NINE-PROVINCE EYEBROW HEIGHT STAFF
1. Pick the peach under the leaves.
2. "Sheung Jing" the immortal plays the flute.
3. Green dragon comes out of the cave.
4. Black tiger sits in the cave.
5. Fish from the stream.
6. Wave the flag.
7. Fui Sing, the god of scholars, kicks the seven stars.
8. Down strike through Wah mountain.
9. Water drips off a sloped roof.
10. Black dragon swings its tail.
11. Offer incense to the sky.
12. Black tiger sits in the cave.
13. "Sheung Jing" the immortal plays the flute.
14. Big hawk stretches its wings.
15. Fisherman rowing the oar.
16. White ape retreats, dragging the knife.
17. Flying up to the sky, holding the trident.
18. "Sheung Jing" the immortal plays the flute.
19. Green dragon comes out of the cave.
20. Black tiger sits in the cave.
21. Green dragon splashes in the river.
22. Offer incense to the sky.
23. Big hawk stretches its wings.
24. Snowflakes cover the head.
25. Turn around, down strike.
26. Fish from the stream.
27. Taoist Tai Kung fishing.
28. Round circle strike.
29. Center spear strike.
30. Left across 1000 soldiers.
31. Right across 1000 soldiers.
32. Jade belt around the waist.
33. Turn around, left right jade belt around the waist.
34. Farmer chops the log.
35. Turn around, farmer chops the log.
36. Monkey carries water.
37. Spinning plum flower.
38. Turn around, holding the pipa (chinese guitar).
39. Middle striking spear.
40. Face front, spinning plum flower.
41. Spinning staff, finish form.

Pek Kwar (Monkey King) version
General Raises the Flag
Hero Wusong Slays the Tiger
Drag the Tiger Back to the Village
Strike Up with the Staff
Immortal Han Shangzi Plays the Flute
Strategist Su Ching Bears the Sword
General Raises the Flag
Hero Wusong Slays the Tiger
Immortal Han Shangzi Plays the Flute
Left Block, Right Rebound
Fisherman Punts the Boat
Strategist Su Ching Bears the Sword
Snowflakes Covers the Head
General Raises the Flag
Hero Wusong Slays the Tiger
Immortal Han Shangzi Plays the Flute
Strategist Su Ching Bears the Sword
Jade Belt Circles the Waist
Fisherman Punts the Boat
Continuous Strikes Up
Sweep Across a Thousand Soldiers
Staff Strikes Nine Continents
White Snake Flicks its Tongue
General Leads from the Horse