Ref. No. 2759/45-4306
In the name of Allah the most Gracious the most Merciful
The answer to your question is as follows:
Dyeing white hair is preferable and leaving white hair undyed is also correct. It is recommended to dye hair with colors other than pure black. Dyeing with red colour or henna is masnoon.
You can dye your beard and hair or leave it white, but the hair should be well-groomed and tidy.
And Allah knows best
Darul Ifta
Darul Uloom Waqf Deaband