The new panel has room for 2 more circuits as mark said. Depending on how close the panel is to where you wish to add the extra circuit will determine the amount of damage to do so.
As for the old panel it is "safe" just not up to code. Circuit can only be loaded to %80 of wire ampacity, 14 gauge=15 amp max load 12 amps.
So it is a little over 70amps but at worst if overloaded, it would trip the main fuse feeding your panel, inconvienent not fire hazzard.
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