Theoretically could you keep growth plates open forever?

[JCaesar]

If you have any open and nuked estradiol to close to 0?

 

[Zoraaaa]

short answer yes long answer yes but you would die

 

[Obamalama]

yes https://www.youtube.com/watch?v=eitQYgCqA-0

 

[Orc]

yes, by chopping off your balls.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4923859/

Even if all these skeletal markers confirmed the advanced age at death of Pacchierotti (81 years old), the epiphyseal lines on the iliac crests were visible (Fig. 3). These lines usually are fused at 23 years old16 and no more traces can be found in 90–100% of over 35 years old males17,18

 

[FrenchChad]

Yes, or at least for a very long time.
Eunuchs/Aromatase deficient men keep growing up to 30+ years old in some cases.