In general, younger patients achieve a better skin
appearance than older people after a liposuction surgery because their tissue is more elastic, allowing it to retract after
the fatty tissues are removed. 
Nevertheless, the age per se is really not the factor that affects the
final outcome of the procedure.
Aside from older patients, those who had experienced significant
weight gain often have poor skin quality; this is not surprising as their
tissue has been stretched to its limit. 
These people usually have visible stretch marks which come in purplish,
whitish, or reddish color.
Stretch marks are a clear indication of poor skin quality;
for this reason, massive weight loss patients will not achieve the same result
enjoyed by people who have maintained normal weight throughout their lives. 
However, it does not mean that massive weight loss patients
cannot have liposuction surgery.  In
fact, it is often used as a complementary procedure to thigh lift, arm lift,
lower body lift, and extensive tummytuck, allowing plastic surgeons to
perform “debulking” to help their patients achieve a more natural body contour.
Patients with poor skin quality may develop some wrinkling
particularly in the upper abdomen and inner thighs.  The “crepe” appearance somewhat resembles the
skin of a patient who has lost the excess fats through exercise and healthy
diet.
But surprisingly, the lower abdomen is not prone to
wrinkling after liposuction.  This is
probably due to the structure of the tissue that allows the area to easily
retract after the fats have been removed.
Meanwhile, there are some plastic surgery ads that promise to remove cellulites through
liposuction.  Patients should bear mind
that these are just a media hype; in fact, the procedure is known to aggravate
the problem, even with the use of laser liposuction.
While laser liposuction—which uses heat to destroy and
liquefy the fats to pave way for their easier extraction—can cause the skin to
slightly retract, it cannot totally repair cellulites which commonly occurs in
the legs and buttocks.
Fortunately, certain procedures can address cellulites, in
case that they appear after liposuction. 
The most popular one is the Mesotherapy, which is an effective procedure
as long as the patients will complete their 10 to 25 sessions. 
While skin irregularities are really a concern particularly
with those with poor skin quality, plastic surgeons have found ways to reduce
their risk.  One of the techniques
includes the use of micro-cannulas instead of large suctioning probes.