Most likely, yes it will need modifications and new circuits. Your microwave, fridge, DW&disposal, hood, and any other high demand appliance should be on dedicated circuits. Plus 2 20 amp small appliance circuits. The cooking appliances need evaluation, depending on configuration. Lighting has to be on its own circuit, not drawn from a counter circuit. Etc. Your Kitchen Designer snd GC should be aware or all of this, and work together to identify needed updates to the home.

Most likely than not any new appliances you purchase today will use less energy and be more efficient than anything purchased when that house was new. That said you should not have any issue using modern appliances in that home. Electrical codes have changed in the almost 50 years since your home was built. It certainly would not hurt to inspect wring and connections to insure all is well. Some 220 volt appliance have gone from 3 wire to 4 wire connections for example. Your cooking appliance(s) will use the most power. Make sure the circuit is rated properly and the connections are good. If you have a cook top for example rated to consume a maximum of 40 Amps and you currently have a 30 AMP circuit you will need to upgrade the wiring and the circuit to accommodate the new cook top. Otherwise, no you don't "need" new electrical.

Compare the ratings on the circuit breakers with the requirements of the new appliances. My late-70's condo has 50-amp breakers for a 240 volt range so this Frigidaire range (for example) which recommends a 40-amp circuit would work fine. My dishwasher has a 20-amp breaker so a 120 volt dishwasher that required less than 20 amps would work fine. This Whirlpool dishwasher, for example, requires only a 15-amp circuit. As mentioned above, also look at the existing outlets and the new appliance's required cord. My range outlet is a 3-wire outlet but many (most?) ranges don't come with a cord so you may be able to buy and attach a 3-wire cord (installation instructions example). (My new LG electric dryer also didn't come with a cord and would accept a 3-wire cord.)