Really there is no age to create your own company ! You can do it when you’re young, middle, old and even if you’re retired. No age.
What is important is to have an idea and really want to do it, execute it. There is a lot of people who create their company at 50 years old and it’s cool.
If you think you have less chance to have success with your company because you start it at 50 years old, you’re wrong. It’s a limiting belief or an excuse.
This envy may be caused by the bitterness of not realizing a dream or the loss of a job or people who are retired who are bored and want to have an activity.
Gary Vaynerchuk has an amazing video about it. Watch it and have fun.