20 Day look back from last entry

I have a sheet in my attached spreadsheet with columns of dates, day, day and time, price in column A, B, C, D, E.

How do I make a formula in a cell in the sheet "Lookback" that will look at the last entry in the columns, update automatically everytime I add data, and tell me the
high and low of the last 20 days/40 days/60 days?

Thank you in advance and please do not hesitate to ask if I did not explain this clearly enough.

Thanks again.

Ivan