If you're looking for numbers, I soloed around 20 hours, and finished up around 60. I was 38. A rule of thumb I've heard is about half your age is the number of hours to solo. It seems to be true of most people I've talked to who have gone through training in the last decade or so.....
In this other thread Jim K posted something I found fascinating
I don't recall hearing that rule of thumb before.
Let me see... I was 24 years old + almost a month
and soloed at about 14 hours... fairly close to half....ratio approx 0.58
that was over a period of about 3 months...and one of those months right in the middle I didn't fly at all.....