That's a great collection of interesting old books but, sadly, age doesn't determine value, although you certainly made a score. I take it you don't speak french. For the ones you have shown:
‘Les Conseils de la Sagesse ou le Recueil des Maximes de Salomon les plus Nécessaires à L'homme pour se Conduire Sagement' (the advice of wisdom or the collection of the maxims of Solomon most necessary for man to behave wisely) is a moralistic religious companion by the Jesuit priest Michel Boutauld.
‘La Laideur Aimable, et les Dangers de la Beauté’ (Amiable ugliness and the dangers of beauty) is a sentimental novel exploring parental love and the shallowness of looks versus personality in relation to the romantic experiences of a beautiful elder daughter and her ugly younger sister. It was later translated into English as ‘Agreeable Ugliness’ by Sarah Scott (1754). The original author (Pierre Antoine de La Place) is best known for the first French translation of ‘Tom Jones’ and of many plays… notably those of Shakespeare.
‘L’Office Complét du Paroissen Suivant le Bréviaire de Paris et Celui de Rome’ (the complete parishioner’s guide according to the breviary of Paris and that of Rome) is a Catholic liturgical book. Also known as the ‘liturgy of the hours’, it details the Catholic daily service for the divine office and the official prayers of the church consisting of psalms, readings, and hymns that are recited at particular hours of the day.
‘Traite de Physique et de Chirurgie ou L’On Expliqué’ is a treatise on anatomy, physiology and surgery by the physician Jean Fontrailles.