Hearing problems and speaker upgrade

Many modern speakers will sound better than 40 year old junk. You may appreciate speakers that can produce detail/resolution without resorting to brightness (to fake you out). Many dudes remain faked out thinking their bright speakers are detailed.

On a different note, the last thing on earth a guy with any amount of hearing loss/ degradation should do is be a purist. Use copious amounts of PEQ, etc to adjust to taste.

This topic speaks to me.

I say you deserve treating yourself to new speakers.

Just find a brand that your ears appreciate whether that's with aids or not.

I highly encourage you to consider some EQ/DSP to help you enjoy music better, including possibly using headphones and software to help compensate.  There are some really excellent sounding headphones and amps that with some EQ can really be satisfying.

A 'music' setting on a hearing aid may be some programmer's idea of what a 'music' setting should sound like with your gear in your room, but it may not be your's. The best ones to get are where you have some kind of EQ functionality from the remote to give you the most control over the sound. Agree with @deep_333 about hearing loss and quest for 'purity'. 

New speakers will sound better if you buy the right speaker - an upgrade.  You will never be young again, but given your current hearing status, new speakers will sound better then your old speakers, and yes, I think you will hear the difference - i.e. what you can hear, will sound better.