I currently live a retirement life, but previously I was engaged in designing equipment with a big Japanese communication equipment company.
The following is a soliloquy.
The equipment that I was conscious about aging is about the power supply equipment and Tx / Rx unit installed in vacuum tubes and artificial satellites used in transponder amplifiers for crossing the Pacific Ocean submarine cable connecting Japan and the USA.
The meaning of aging in this case was to deliberately perform initial deterioration of parts at the manufacturing stage and to obtain stable performance for a long time thereafter.
Furthermore, I have dealt with many audio devices for television broadcasting stations, but my design did not consider the aging of these electronic circuits at all.
The aging effect said in the world of audio fans is not much thought in the professional world of our circuit design.
In the audio equipment I use, I have never recognized a change due to clear aging except the speaker.
Regarding the balance connection which is frequently discussed recently, I have never been conscious that sound is good. In design, it adopts for the purpose of removing induced noise by a long transmission distance to the last.
But among Audiophils it is said that the sound is better with a higher grade.
The world of Audiophil is full of wonders and is fun!