Fond as I am of old Neil he has some odd ideas about fidelity, given the abysmal quality of some of his recordings and the way he has made an art form of guitar distortion.
Personally I prefer CD to MP3 because I'm old too and can find tracks more easily in physical media than hunting through menus.
I have many vinyl albums but only a few (early Decca stereo and EMI Motown monos) which could really be said to sound better than the best CDs -- mainly because they were mastered at high levels (probably with lots of compression) and using valve (tube) equipment, so have a warm sound.
Many 'classic' 1970's US rock albums recorded on analogue transistorised studio equipment sound appalling on vinyl but may have been improved when remastered to CD.
Well produced material (e.g. The Doors albums which were recorded in a simple manner like modern jazz ) sound better once remastered to CD.
I have CD-Rs burnt from MP3 tracks converted to WAV and most sound okay to me.
Though Neil Young's music with Buffalo Springfield and some with CSNY is fabulous, a great deal is idiosyncratic to the point of being eccentric -- as are his views (like those of most musos) on electronics.