How saggy are my breasts for a 32-year-old? (Photos)

I actually don't think your breasts are that "saggy". You have a bit of pseudoptosis, or fake droop, meaning that you the majority of your breast tissue hangs below your fold while the nipple stays in relatively normal position. To offer a rounder, perky appearance, I'd recommend a breast lift with a short-scar, otherwise known as a "lollipop scar". We can use some of the tissue on the underside of your breast to augment what you have if you are not interested in a breast implant. Recovery is less than a week. All my best.

You have a very common complaint and one that can only be appropriately treated with a lift and under the muscle implants. You will have some scarring (lollipop shape) but it is the only method to provide the look that will make you happy.

In the Renault scale of breast ptosis you are probably a grade 2.  You would benefit from a vertical lift and an implant for more volume if you would like.  

Hello and thank you for your question.  The
best advice you can receive is from an in-person consultation.  With that
being said, based on your photographs, the best shape and contour could be
achieved with an implant and a breast lift. Your nipple sits below the
inframammary fold and without a lift in addition to the implant, this will not
have a natural shape.  A breast lift with an implant can result in a very
nice shape if good technique is used.  The size, profile, and shape of
the implant is based on your desired breast size/shape, your chest wall
measurements, and soft tissue quality.  This decision should
be based on a detailed discussion with equal input from both you
and your surgeon.   Make sure you specifically look
at before and after pictures of real patients who have had this surgery
performed by your surgeon and evaluate their results.   The most
important aspect is to find a surgeon you are comfortable with. I recommend
that you seek consultation with a qualified board-certified plastic surgeon who
can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.
Harvard-trained plastic surgeon

From the Photos that you have shown it appears that you would benefit from breast implants being placed. The implants will restore your breast volume for sure. Other than that you may need to have a small, around the nipple, lift. I recommend you schedule a consultation and measurements can be taken at that time. Make sure you see an experienced Board Certified Plastic Surgeon.