How bad are these driveshaft splines?

[maynardjr]

I'd like the opinion of more experienced Brickers than me about how these driveshaft splines look.  I'm curious how long folks think I have until I need to replace the driveshaft.

This is a 1991 K75S with about 50K miles. I bought it with 31K in 2019, and this is the third time I've lubed final drive spline (every time I've replaced the rear tire: 34K, 41K, and 50K).

[sooprvylyn]

Hard to tell for sure with 1 photos, but they look pretty good to me. Def SOME wear, but they don't look terrible based on the photo