I am now 63, a retired RN & I sing in 2 choruses.
I have had classical voice training the past 5 years-as a Second Soprano & now recent choral Directors want a much less vibrato sound. One moved me, briefly, to Alto section due to the weight of my voice.
I think the resonance in my voice has increased with training & vibrato sounds more pronounced especially on higher notes. I think breath control may be key, perhaps lightenning higher notes? I think my tone is too forced @ times. I enjoy singing Broadway,Torch & Blues songs.I have been lowering the keys I sing my songs.
I would request input from others on breath control as one ages and keeping tone of voice pleasant, as one ages.