As a french citizen, I agree it's not about numbers.
If young people were understanding the numbers, they would go on streets to push for the reform to be adopted.
The problem is, there is an extreme left group, dreaming of the big night of uprising and revolution to install a communist government in France. So they take every opportunity to block the country and mess everything up, even though they're not even concerned by the reform themselves.
There is a silent majority who is in favor of the reform, which will eventually pass, like always.