Well apart from all mentioned ones, there are several other ways to find the last row or column in a worksheet or specified range.
Function FindingLastRow(col As String) As Long
'PURPOSE: Various ways to find the last row in a column or a range
'ASSUMPTION: col is passed as column header name in string data type i.e. "B", "AZ" etc.
Dim wks As Worksheet
Dim lstRow As Long
Set wks = ThisWorkbook.Worksheets("Sheet1") 'Please change the sheet name
'Set wks = ActiveSheet 'or for your problem uncomment this line
'Method #1: By Finding Last used cell in the worksheet
lstRow = wks.Range("A1").SpecialCells(xlCellTypeLastCell).Row
'Method #2: Using Table Range
lstRow = wks.ListObjects("Table1").Range.Rows.Count
'Method #3 : Manual way of selecting last Row : Ctrl + Shift + End
lstRow = wks.Cells(wks.Rows.Count, col).End(xlUp).Row
'Method #4: By using UsedRange
wks.UsedRange 'Refresh UsedRange
lstRow = wks.UsedRange.Rows(wks.UsedRange.Rows.Count).Row
'Method #5: Using Named Range
lstRow = wks.Range("MyNamedRange").Rows.Count
'Method #6: Ctrl + Shift + Down (Range should be the first cell in data set)
lstRow = wks.Range("A1").CurrentRegion.Rows.Count
'Method #7: Using Range.Find method
lstRow = wks.Column(col).Cells.Find("*", SearchOrder:=xlByRows, LookIn:=xlValues, SearchDirection:=xlPrevious).Row
FindingLastRow = lstRow
End Function
Note: Please use only one of the above method as it justifies your problem statement.
Please pay attention to the fact that Find method does not see cell formatting but only data, hence look for xlCellTypeLastCell if only data is important and not formatting. Also, merged cells (which must be avoided) might give you unexpected results as it will give you the row number of the first cell and not the last cell in the merged cells.