103-year-old nun Sister Teresita, a member of the Buenafuente del Sistal Convent north of Madrid will finally emerge into the outside world on Friday for a very special occasion.She has spent every day of the past 84 years inside the walls of her convent in central Spain.The nun will meet Pope Benedict XVI during his visit to the Spanish capital of Madrid to celebrate World Youth Day.She has been a resident at the convent since April 16, 1927. This, by coincidence, is the same day that Joesph Ratzinger - now Pope Benedict XVI - was born.The last time the centenarian left the compound was during the Spanish Civil war, which took place between 1936 and 1939. Even then she only fled for a few hours at a time to escape the overnight fighting.The convent's mother superior, named only as Maria, said: 'She said she thinks she will make the trip with her eyes closed, so that nothing will distract her.'Sister Teresita is a minor celebrity in the area around the nunnery after a book was published detailing her life inside the convent.In the book, titled "What is a girl like you doing in a place like that", she is quoted as saying: 'Who can spend 84 years in a convent without being happy? Of course I’m happy.'She adds in the book that she was encouraged into the Church by her father, who said that it was a way for them to escape extreme poverty.She claims that when she entered the convent she only had a vague idea of what life would be like and that over the years she found happiness.Sister Teresita's visit to Madrid comes as thousands congregate there to welcome the Pope.Pilgrims will camp out under the stars in an area the size of 48 football pitches ahead of his visit, which begins on Thursday.The city has been transformed with yellow and white banners lining the streets, while religious events and concerts have been planned. Huge screens have also been erected to broadcast the events across the city.Hundreds of priests, speaking 30 languages, have also been called in to listen to sins in 200 specially constructed confessional booths.However, the visit has stirred up tensions in the country, with many asking how the Government can afford to spend the money on the visit during its economic crisis.