Would a 21-year-old girl agree to marry a 54-year-old man if he possesses high morals and strong religiosity, and how would she deal with her family regarding this matter?

It is preferable to consider the age difference between spouses, as it is more conducive to harmony. Nevertheless, there is no harm in a girl marrying someone significantly older than her, especially if he is religious and has good character. There is no objection to rejecting a suitor if there is a strong benefit in doing so, or if the parents object to the marriage due to the age difference.