I think your own voice comes through eventually, something to do with time and with confidence. I think that mine has changed over the years and that is no bad thing. I eventually realised that I didn't have to be a clone of other singers.

Listening to other singers (source or revival) is something I always suggest when running workshops and i like the idea of burning discs.

And I definately agree with being non ageist when listenig to singers I've heard some in their 70's that sound better, more rounded, than those far younger.