Of course dude, she is almost 70, do you expect her to sing like 20 years old girl, impossible
Ebi is probably the only one which you notice a little change in his voice, but even him after few songs in live concert he can't keep it up as at the beginning which is totally normal for his age. Dariush same thing, his voice can't keep it up as well.
Overall, our music situation both in Sonati and Pop is in very critical situation. The number of internationally recognized musician we have is how many? 1-2-? Kahor and who esle?( Unless you include the wonder Bineshpajoh in this category
).