How to use pre 1970 dates in MT4 ?
As you know, Metatrader doesn't allow tests before Jan 1 1970.
We can only get 46 years of data displayed on the charts.
The most simple solution is to alter your data in excel by modifying the years. You won't get the total span between your pre 1970 date and now, but a range between two old dates (for example between 1930 and 1976 for daily chart).
You can also take the monthly values and put them in the H1 history to get more monthly bars on chart.
Another altenative is to develop an indicator that will show a monthly chart on H1, with monthly data if you just want to see the tops and bottoms over 100 years.