You got to put a picture of the article
In order for Luke to write his Gospel, he had to go to another sources, since we wasn't himself an apostle (one of the twelve first followers of Jesus Christ)
To tihs day, there is a lot of controversy as of Luke's sources and even his identity. One of the few things we know for sure is he took writings from apostles Mark and Mathew. From the list of responses, we can also pick the name Paul, since Luke is named in the bible "a companion of Paul"
Answer:
The navigational tools provided were inaccurate, Financial risks, and the explorers only had limited knowledge of the geography of the world, so the possibility of them getting lost was high.
They would be around 65 to 75 or even older
