I'm learning Japanese at an advanced age, and I'm having difficulty hearing R.
Depending on the speaker, I hear one of three different consonants: R, or L
but also it can sound like a D. In the first two cases, I know that it must be
R, but when I mistake R for D, well, it can change the meaning. For example: I
was pronouncing understood _waka **r** imashtia_ as _waka **d** imashtia_
because that's what I perceived. I've been replaying the lessons again and
again, but I'm just not hearing it.

Is there any set of exercises or listening techniques, anything that helps?
Also, is this a common problem for older students?

_Addendum post comments:_ I see from the related post that my problem is sort
of the inverse of the issue therein but nonetheless a function of my own brain
literally being stuck in English. And it seems time, practice, and
perseverance are my only remedies. Thank you for your time and attention.
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2019-06-07T20:46:30.013
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2019-06-08T21:58:06.577
2019-06-08T19:27:49.830
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question
pronunciation
Listening, I mistake R for any of L, R or even D. Is there any exercise to improve my ability to hear this sound correctly?