Is it permissible for someone who has not yet married to fast every day voluntarily?

It has been established that voluntary fasting is of two types: absolute and restricted. Restricted fasting is tied to a specific time, such as Mondays and Thursdays, or three days out of every month, or to an individual's circumstance, such as a young man who is unable to marry. For him, the legitimacy of fasting becomes more emphasized, and this emphasis increases as the provocations he faces multiply. It is best for him to fast one day and break his fast the next, as this is the best form of fasting; there is no better fasting than that of David (peace be upon him). As for fasting every day, which is perpetual fasting, scholars have differed concerning it, and the preponderant opinion is that it is disliked.