Young people do start farms. Young people do start software companies. Both businesses are hard and require brains, motivation, luck and ability. It is a communications problem to alert people of the opportunities for combining agriculture production with the development of market channels. The government can use its bully pulpit to help with this communications problem.
All new businesses require capital.
It takes convincing people to obtain capital. People who want to engage in traditional agriculture have a hard time raising capital because they are trying to finance a business that does not have a great outlook for large returns. That is why people trying to start a traditional farm have to resort to borrowing money and thus having a fragile, underfinanced business. Creating a business with borrowed money is a very risky way to proceed. I think the elimination of inheritance taxes would help create a much better climate for investment in agriculture.