election that is expected to pit far-right incumbent Bolsonaro against former President Luiz Inácio Lula da Silva of the leftist Workers' Party.In Brazil, voting is mandatory for anyone aged between 18 and 70, and failure to vote entails paying a small fine. Those 16 and 17 can vote, but are not obligated and young people have been at the center of a nationwide get-out-the-vote campaigns.Brazil's electoral authority says it has received a record number of registration requests.DiCaprio, an environmental activist, has feuded previously with Bolsonaro over the Brazilian leader's efforts to expand development in the Amazon rainforest.With the deadline nearing, DiCaprio sent three posts on his official Twitter account — all written in Portuguese — to encourage registration.“Sixteen and 17 year olds have the power to help build Brazil’s future,″ he wrote in one, linking to a website with step-by-step instructions on how to register.