Password Reset -

Apologies i advance but I can't find the appropriate forum to ask this question, hence me asking it here.

I just want to know if it's possible to reset my password. I can't do it via my email address as the address I used for setting it up has been defunct for a number of years now and I don't want to factory reset for fear of losing my data.

Any ideas as to how I can reset/ negate the current password?