Usually, it's stressful because you need to convince people to trust you and make business with you.
Salespeople represent companies and try to sell their products or their services to clients.
They meet new clients, make calls, emails, and they try to sell the products of the company.
Usually, they go meet their clients, or they can work from home or the office.
You need a secondary degree, a college degree, and you can get a university degree if you want to go further.
The salary depends on the sales of the salesperson, if he makes good sales his salary will reflect it.
A salesperson should learn how to deal with clients and how to make them feel comfortable to speak to you.
There is always a risk that you may not succeed as far as you thought and don't make enough money.
I don't think salesperson will be replaced soon by robots because human needs something they can relate to to be comfortable, trust the deal and then make the deal.
Salesperson can retire when they have enough money to do it because their retirement is not made automatically, they need to take care of it.