My son (8years old). Had a little money burning a hole in his savings account. Instead of the things he had in mind, we went partners on 6 what we call tag backed calves. Calves that sell as singles at the front of the sale. We kept them 6 weeks. We split the cost of the calves, meds, feed, and I gave him his part of the hay. He helped put it in the barn anyway. Kept them 6 weeks, and one day. 5 gained well in excess of 2 pounds a day. One barely gained 1 pound a day. The 5 made it in a graded pen. The knot sold again as a single. He cleared $240 to his part. He had an almost 10% return on his investment in 6 weeks. He's hooked.