2023 Maryland Minimum filing level

2023 Maryland minimum filing level for single 65+ is $15,700.   On Maryland Form 502 Line 16 is Maryland Adjusted Gross Income.   If your line 16 is less than $15,700, and if you are single 65+, does that mean you are not required to file Maryland tax, and if you do file, is your Maryland Adjusted Gross Income taxed for both Maryland tax and Local tax?

If it's not Line 16 on Maryland Form 502, which line is counted toward the Maryland minimum filing level?