Newb here, I'm 54 (male) and at 16 I could hit high A5. Back then it sounded like a mix of Geddy Lee and Tiny Tim. But I could make sound at least. I finally decided to learn how to sing properly about a year and a half ago and found that I had only lost a whole tone. I recently checked, after doing Robert's course for only a week-ish, and found that I could easily reach the A5 again. It's fuzzy, but it's there. I cannot get any higher, but I'm glad I can still reach it. My (new) tone is fine and usable up to C5. Maybe E5. So, I'll take it. I'll check back in ten years!