How do I upgrade my 60 amp fuse box to a 100 amp breaker box? The main entity I need to know is...how can I determine if...

The main entity I need to know is...how can I determine if the service coming to the meter box and consequently into the house is suitable for a 100 amp breaker box? The wires coming from the pole to the house and from the meter box and outside disconnect into the fuse box appear to be as old as the house. The house be built in 1950.
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Safest thing gain a good electrician and within my opinion when you replace your service put surrounded by a 200 amp box cost about matching as a 100 amp also according to code you will probable have to replace from the weather principal down.