If you took the Medical Deduction for Federal LTC premiums during those years, you cannot take the deduction on the Virginia return this year.
However, if you did not take these deductions, enter the amount where TurboTax is asking for them. This may also be helpful in the calculations necessary if you have started receiving distributions from these plans.
The following article from the Virginia Tax Commissioner describes some of these issues which may be helpful:
https://www.tax.virginia.gov/laws-rules-decisions/rulings-tax-commissioner/07-211
