Do inner thighs sag with age like upper arms; how do I know if this is loose skin or excess fat? How is it treated?

inner thighs are a bit tricky with their fat distribution. excess fat can herniate thru otherwise healthy skin and can cause the thighs to rub against one another. it can appear as if you have increased skin laxity but in fact its just extra fat. having said that, its best to have yourself evaluated and take it from there. it could be excess skin AND fat. 

Based on your ht and wt, it doesn't sounds like you are overweight, but sometimes it's possible to have extra excess fat even in some places in patients who are not otherwise obese.  I would recommend having an evaluation to determine if it's skin or fat.  Be sure to discuss your goals and concerns with your board certified plastic surgeon and consider the pros and the cons. Be certain your surgeon is properly certified.  I've attached a link where you can start your search. 

Yes, the inner thighs can sag similarly to the arms. For best results in improving this, I recommend a hi definition procedure like VASER liposuction which can be performed at the same time as a thigh lift, if you're a candidate. I use VASER HI DEF with ThermRF and fat grafting to get the most fat removal, skin tightening, contour and definition. This combination will give you the most toned result. I recommend getting a formal evaluation with a hi definition physique expert. Best, Dr. Emer

Poetsjasmine.   I feel your pain! As we age, metabolism slows, making it harder and harder to maintain or lose weight, no matter how much we diet and exercise! Skin also becomes more lax.  If increasing Triceps muscle mass does not improve upper arms, then brachioplasty is your best option. Same philosophy for your thighs.  Sometimes just liposuction can greatly improve upper inner thighs, as this is a problem area for many as it does not respond well to diet and exercise. Be sure to consult with a board certified plastic surgeon. Good luck!

Hello and thank you for your question.  The
best advice you can receive is from an in-person consultation.  If you have excess tissue laxity in the arms and thighs, then an arm lift and thigh lift are the best options.   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

Yes, inner thigh skin is similar and likely weaker than inner arm skin by the armpit. An evaluation in person would help delineate what might be best for you.