Salesperson

I've encountered a businessman who has been in his small less-than-10-people business for more than 20 years, who always hire mature salesperson (usually in their late 20's, up to early 40's with existing experience in the industry but not necessarily business-savvy).

He always faces problem with retaining these people as they always eventually decided to exit to set up their own business and half the time fail (but that's another story).

Assuming that the renumerati0n and motivation is there, how do you find ways to retain these people? Shareholding is one factor to consider with these people; provide them incentive at the end of the year in the form of shares.

Or does it make more sense to hire younger, impressionable and more energetic people? You do not need to offer share options or profit-sharing as incentives, all you need is just to provide a couple of essentials
1. Strong and clear sales directions
2. Fair and equitable motivations
3. Opportunities to grow, and upgrade their knowledge
4. Pleasant and happy working environment

Sounds easier with this setting than the complexity and possible complications from profit-sharing.