personal finance stuff and the numbers I use are:

20's = 10%
30%=20%
40s=30%
50s=40%
60s=50%

No one size fits all and many people never save less than 15% especially when young. But if you have kids, a mortgage and life it is tough

The one other thing I stress is for people to give up on the idea of a budget. While I do teach budgeting at many levels. A spending plan is better for the vast majority of people. They are similar but far different.