Anyone can visit.
I am going to Lourdes > je vais à Lourdes - to go is 'aller' in French (conjugated verb in link)
There is no age stipulation. From babies to pensioners, you will find them in Lourdes.
Lourdes is always open. You can go there at any time.
Lourdes Pantin goes by Lulu.
Lourdes Colon goes by Tita.
Lourdes Cols goes by Lulu.
It is mainly of interest to Christians, so it is mostly Christians that go, but anyone can go to Lourdes.
Easter is the big annual HCPT pilgrimage to Lourdes.
Myriam De Lourdes goes by Mimi.
It is mainly Catholics, but anyone can go and many people who are not Catholic go to Lourdes too.
The Hajj is a pilgrimage undertaken by Muslims who go to Mecca. Lourdes is a place of pilgrimage for Catholics. Millions of Muslims go each year to Mecca and millions of Catholics go each year to Lourdes.
There is an airport near Lourdes, so many people fly to it and are then brought to Lourdes by bus. People also go other ways, depending on where they are coming from. They could drive, or go by bus or train. So there are many ways of getting to Lourdes.