High Voltage Indicator based on specific threshold value
If you want something really simple where the 60V threshold is not stunningly accurate then try a Constant current sink in series with a Zener diode .The constant current sink could be set up at say 6 mA .This value does not need to be accurate so a 100 ohm resister across the base and emitter of a garden variety       npn BJT like BC547     would suffice for LED current sensing .The pass transistor must be rated for the voltage and a safety factor.You could use an old fashioned N channel mosfet like BUK454 800 which is rated at 800V and comes in a TO220 package .You do not need low on resistance so why pay more money .You will be wasting some power at high input voltages so the TO220 package is sensible .You will need a heatsink if extended operation at high voltages is intended.The older mosfets are better in the linear mode when it comes to even die temperatures.You could use a NPN BJT as the main device in your constant current source .The issues of power dissipation and voltage rating still apply .Safe operating area should also be checked.The zener is chosen to give the 60V threshold .It will be of course  a little bit less than 60V because of the LED drop and the Drop of the constant current sink.You may want to use 2 Zeners in series to get the desired performance .Zener power dissipation is not a problem .It will be less than 360mW with a 6mA LED current.I have used diacs in circuits like this to give hysteresis meaning that the LED is either on or off .I placed the diac in series with my 2 Zeners .The diac is less accurate than a Zener but I did not have to have high accuracy .I used lower LED currents to allow SMD devices.