The aspect itself does not really apply to the type he will be looking for, it shows the disappointments, conflicts and setbacks he may experience in relationships. I would resist the idea of a person becoming attached with someone who has the same square as himself; rather he would instinctively look for someone to offset that challenge within himself. It is the sign influence of his Moon, Venus and Mars [combined] that will show his desires,expectations and needs in relationship; what he may consciously look for in connecting with others; in contrast, the aspects define his own subconscious plus or minuses in relationships.
Saturn = maturity, age: he might often look for someone younger or older, based on their social status and position; relationships later in life would be more solid and stable. A balance of maturity would be required in this case to avoid discord. The square might imply a lack of maturity in one party or the other that generates problems. Yes delays in relationships would be in store for him.
In either case, Venus also relates to expectations in relationships, and can indicate distorted, or unrealistic expectations- putting the other person on a pedestal- only to be disappointed in the long run. IF he suffers low self esteem and insecurity, he would be looking for someone who is protective and caring for him; perhaps something of the mothering type. Relational attractions are based on more than just Venus. Mars will show his energy expression in establishing relationships, as well as his inner desires; Venus/Saturn can be more retentive or hesitant in making his feelings known, and he may have difficulty expressing affection openly, so he would be looking for someone who will be more assertive in engaging him in a relationship. Often the Moon will show his innermost desires in a relationship.