Check to see if your old LLC is even still active on the state's roster.
I know where I used to have mine (MA), it would be "administratively closed", i.e. dissolved, if you didn't file your annual reports and other paperwork timely. I think it was 3 years before the Secretary of State would close it, but that's a distant memory. That probably also varies by state.
If it was administratively closed, you might had some significant expense to resurrect it - like paying 10 years of back fees and filing 10 years of back reports. Again, check with your state.
I suspect that it would be cleaner and easier to just start a new one. Especially if there's any chance of latent liability.