This message was posted on behalf of Intel Corporation
Thank you for joining the Processors Community. I can sure help with your inquiry..
I will answer in the same order you posted the questions, see below.
1) The voltage range for this model in operating modes goes from 0 to a maximum of 1.52V. This means that any parameter in this range is completely fine, the voltage behavior you mentioned is fine based on that.
2) The maximum is 1.52V, the lifespan of your processor was not affected since it was running under the specification.