Do u have to pay off old debet in oreder get a goodcredit score or if i pay my crdit cards on time it will aut

I had a credit card 8 years old if i never pay it off and just keep paying my current bill on time can my credit score go up or will it be bad untill i pay off old debts i am trying to make sur i can buy a house in the next 2 years whats the quickest way 2 boost credit