The Verdict: Not eligible
Portugal has no youth mobility agreement with your country, so there is no youth visa for you. Look at the routes that do not depend on nationality: the digital nomad, skilled migration and retirement quizzes.
Portugal's agreements are with Argentina, Australia, Canada, Chile, Japan, New Zealand, Peru, the Republic of Korea, the United States and Uruguay. They depend on your passport, not where you live, so check any second nationality against the list.
If you work remotely for employers or clients abroad, the digital nomad visa is built for that, and if you live on income you do not work for, the retirement quiz covers the D7 visa. Neither has an age limit.